【单选题】
共析钢在冷却转变时，过冷度越大，珠光体组织的层片间距越小，强硬度___。
A. 越高
B. 越低
C. 不变
D. 与冷却度无关
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相关试题
【单选题】
将钢材或钢件加热到Ac1或（Acm）以上30~50 ℃，保温适当的时间后，在静止的空气中冷却的热处理工艺称为___。
【单选题】
为消除过共析钢中网状渗碳体，便于球化退火，过共析钢球化退火前应进行一次___。
A. 完全退火
B. 等温退火
C. 正火
D. 回火
【单选题】
工件出现硬度偏高这种___缺陷时，补救办法是调整加热和冷却参数，重新进行一次退火。
【单选题】
退火方式是___。
A. 扩散退火
B. 去应力退火
C. 球化退火
D. 完全退火
【单选题】
35号钢铸造后存在魏氏组织，再经正火处理后，可得到均匀细小的___与珠光体晶体，使机械性能大大改善。
A. 奥氏体
B. 铁素体
C. 渗碳体
D. 莱氏体
【单选题】
正火与退火相比，主要区别是___，所获得的组织较细，强度、硬度比退火高些。
A. 退火冷却速度较快
B. 正火冷却速度较快
C. 正火冷却速度较慢
D. 正火加热速度较快
【单选题】
淬火钢在回火时，随着回火温度的___，其机械性能变化趋势是强硬度降低，塑韧性提高。
【单选题】
化学热处理是指在一定温度下，在含有某种化学元素的活性介质中，向钢件___，从而改变钢件表面化学成分以获得预期组织和性能的一种热处理方法。
A. 表面渗入某种化学元素
B. 内部渗入某种化学元素
C. 表面感应某种化学元素
D. 内部感应某种化学元素
【单选题】
渗碳的目的是使零件表面具有高的硬度、耐磨性及疲劳强度，而心部具有___。
A. 较高的韧性
B. 较高的塑性
C. 较低的韧性
D. 较低的塑性
【单选题】
电动势是衡量电源将___本领的物理量。
A. 非电能转换电能
B. 电能转换成非电能
C. 热能转换成电能
D. 电能转换成热能
【单选题】
电路中某点的电位就是该点与电路中___。
A. 零电位之间的电压
B. 零电位点之间的电阻
C. 参考点之间的电压
D. 参考点之间的电阻
【单选题】
在串联电路中，电压的分配与___，即阻值越大的电阻所分配到的电压越大，反之电压越小。
A. 电阻成正比
B. 电阻成反比
C. 电阻平方成正比
D. 电阻平方成反比
【单选题】
通电导体在磁场中受到___的大小与导体中的电流及导体在磁场中的有效长度成正比。
A. 电磁力
B. 机械力
C. 电场力
D. 动力
【单选题】
___大小与磁路长度成正比 ，与铁芯截面面积成反比。
【单选题】
埋弧自动焊在正常电流密度下焊接时其___为平特性区。
A. 内特性
B. 外特性
C. 静特性
D. 动特性
【单选题】
仰焊时不利于熔过渡的作用力是___。
A. 重力
B. 表面张力
C. 电磁力
D. 气体吹力
【单选题】
当熔渣的碱度为___是，称为碱性渣。
A. 1．2
B. 1.4
C. 1.5
D. >1.5
【单选题】
焊缝中的偏析、夹杂、气孔等缺陷是在焊接熔池的___产生的。
A. 一次结晶过程
B. 二次结晶过程
C. 三次结晶过程
D. 一次结晶和二次结晶过程
【单选题】
低碳钢由于结晶区间不大，所以___不严重。
A. 层状偏析
B. 区域偏析
C. 显微偏析
D. 火口偏析
【单选题】
低碳钢焊缝二次结晶后的组织是___。
A. 奥氏体+铁素体
B. 铁素体+珠光体
C. 渗碳体+奥氏体
D. 渗碳体+珠光体
【单选题】
承受动载时，___角焊缝的承载能力最高。
A. 凹形
B. 凸形
C. 平形
D. 承载能力一样
【单选题】
粗丝二氧化碳气体保护焊的焊丝直径为___。
A. >1.2mm
B. 1.2mm
C. ≥1.6mm
D. 1.2~1.5mm
【单选题】
当CO2气体保护焊采用细焊丝、小电流、低电弧电压施焊时，所出现的熔滴过渡形式是___过渡。
【单选题】
在NBC—250型中用___表示熔化极气体保护焊机。
【单选题】
细丝二氧化碳气体保护焊是使用的电源特性是___。
A. 平硬外特性
B. 陡降外特性
C. 上升外特性
D. 缓降外特性
【单选题】
二氧化碳气体保护焊是使用的焊丝直径在___的半自动焊枪是推丝式焊枪。
A. 1mm以上
B. 2 mm以上
C. 3 mm以上
D. 4 mm以上
【单选题】
二氧化碳气体保护焊时应___。
A. 先通气后引弧
B. 先引弧后通气
C. 先停气后熄弧
D. 先停电后停送丝
【单选题】
二氧化碳气体保护焊焊接回路中串联电感的原因是防止产生___。
A. 电弧燃烧不稳定，飞溅大
B. 气孔
C. 夹渣
D. 凹坑
【单选题】
用CO2气体保护焊进行10mm厚的板材立位焊接时，宜选用的焊丝直径是___。
A. 0．5mm
B. 0.6mm
C. 1.0~1.6mm
D. 3.2mm
【单选题】
具有良好的___作用的焊接方法是氩弧焊。
A. 容易引燃
B. 阴极破碎
C. 稳定性差
D. 热量分散
【单选题】
___的代表符号是TIG。
A. 钨极氩弧焊
B. 手弧焊
C. 埋弧焊
D. CO2气体保护焊
【单选题】
熔化极氩弧焊焊接电流增加时，熔滴尺寸___。
A. 增大
B. 减小
C. 不变
D. 增大或不变
【单选题】
氩气和氧气的混合气体用于焊接低碳钢及合金钢时，氧气的含量可达___。
A. 5%
B. 10%
C. 15%
D. 20%
【单选题】
在电极与喷嘴之间建立的等离子弧称为___。
A. 非转移弧
B. 转移弧
C. 联合型弧
D. 双弧
【单选题】
等离子弧焊焊枪中，___内缩的原因是为了避免在焊缝中产生夹钨的缺陷。
A. 喷嘴
B. 焊丝
C. 钨级
D. 等离子弧发生器
【单选题】
从防止___考虑，应减少焊接电流。
A. 晶粒细化，提高生产率的角度
B. 过热组织，提高经济效益的角度
C. 组织过热，和细化晶粒的角度
D. 组织粗大，保护电极的角度
【单选题】
18MnMoNb焊前预热温度为___。
A. 〈50℃
B. 50 ~100℃
C. 100 ~150℃
D. ≥150℃
推荐试题
【单选题】
A developer needs to create a multi-tier development stack for a home lab. Which vSphere product will support the architecture required for the least software cost? ___
A. vSphere Hypervisor
B. vSphere Essentials
C. VMware Player
D. VMware Workstation
【单选题】
An administrator is installing Windows into a virtual machine. The DVD has been mounted on the Host and configured for the virtual machine as shown in the Exhibit. Based on the exhibit, when the virtual machine is booted, why would it attempt to search for a PXE server? ___
A. The CD/DVD device is not connected.
B. The ISO is in the incorrect storage location.
C. The OS minimum requirements have not been met.
D. The CD/DVD device is not set to Client Device.
【单选题】
What component must be installed prior to deploying a vCenter Server in vSphere 6.x? ___
A. vCenter Identity Services
B. Platform Services Controller
C. vCenter Single Sign-On
D. Client Integration Plug-In
【单选题】
What is a valid plug-in status for a plug-in that has been added to a vSphere client? ___
A. Disabled
B. Unknown
C. Stopped
D. Installed
【单选题】
Users of an application are reporting performance issues. The following performance values are observed in the vSphere Web Client: <Host CPU utilization is 90%> <Virtual Machine memory utilization is consistently greater than 90% CPU Ready values are higher than 20%> What could be the cause of the application performance issue? ___
A. The host is lacking the CPU resources required to meet the demand.
B. The host is lacking the memory resources required to meet the demand.
C. The virtual machine is lacking the CPU resources required to meet the demand.
D. The virtual machine is lacking the memory resources required to meet the demand.
【单选题】
An administrator creates an ESXi cluster using vSphere Auto Deploy. The ESXi hosts are configured to get a management IP address from a DHCP server. The administrator needs to troubleshoot the management network on one of the hosts. Which DCUI option should the administrator use to renew the DHCP lease? ___
A. Restart Management Network
B. Restore Network Settings
C. Test Management Network
D. Configure Management Network
【单选题】
An administrator is re-provisioning an ESXi host and moving it to another datacenter. Which DCUI option should the administrator use to revert the system configuration to the default settings? ___
A. Reset System Configuration
B. Rebuild Default System Configuration
C. Revert System Configuration
D. Renew Default System Configuration
【单选题】
An administrator has just completed installing an ESXi 6.x host, but doesn't know what address has been configured. Where is the ESXi host IP address configured? ___
A. RVC console
B. Direct Console User Interface
C. vSphere Web Client
D. vSphere Client
【单选题】
When is it possible to place a VMFS5 datastore in maintenance mode? ___
A. When it is a member of a Storage DRS cluster
B. When it is a member of Virtual SAN cluster
C. When it is a member of a multi-extent datastore
D. When it is a member of a Virtual Volume
【单选题】
Immediately after installing ESXi, an administrator observes that the Configure Lockdown Mode option is grayed out in the Direct Console User Interface (DCUI). What is the most likely explanation? ___
A. The host has not yet been added to a vCenter Server.
B. The BIOS on the host does not have NX/XD enabled.
C. The ESXi host is running in evaluation mode.
D. The host requires a reboot before this feature is available.
【单选题】
Immediately after installing ESXi, an administrator observes that the Configure Lockdown Mode option is grayed out in the Direct Console User Interface (DCUI). What is the most likely explanation? ___
A. The host has not yet been added to a vCenter Server.
B. The BIOS on the host does not have NX/XD enabled.
C. The ESXi host is running in evaluation mode.
D. The host requires a reboot before this feature is available.
【单选题】
Which Single Sign-On deployment mode should an administrator use for two 6.x vCenter Servers configured with linked mode? ___
A. Basic Single Sign-On with vCenter Server Heartbeat
B. Multisite Single Sign-On
C. Basic Single Sign-On
D. Single Sign-On with Linked Mode
【单选题】
What is required when changing a virtual machine name using the vSphere Web Client? ___
A. Verify connectivity to the ESXi host where the virtual machine is running and its inventory list is accessible.
B. Verify in which datastore the virtual machine resides and that you have access and its inventory list is accessible.
C. Verify that virtual machine files are stored in the same datastore and can be accessed in the datastore browser list.
D. Verify the virtual machine is not running in Fault Tolerant mode and that it is not in a Distributed Resource Scheduler cluster.
【单选题】
An administrator deploys vRealize Operations into a vSphere 6.x environment. After the deployment, the administrator notices that badges are not appearing. What is a likely cause of this behavior? ___
A. Badges do not appear until you register vRealize Operations with vCenter Server.
B. Badges do not appear until you register a vCenter Server in vRealize Operations.
C. The vRealize Operations appliance needs to be redeployed.
D. The vCenter Server appliance needs to be redeployed.
【单选题】
How are ports scaled on vSphere Standard Switches (vSS)? ___
A. Ports on a vSS can be dynamically scaled up and down.
B. Ports on a vSS can only be statically scaled up or down.
C. Ports on a vSS can only be dynamically scaled down.
D. Ports on a vSS can only be dynamically scaled up.
【单选题】
A High Availability (HA) cluster is configured to respond to a given number of host failures. The cluster contains virtual machines configured with these settings: VM1 has a 1GHz CPU reservation and no Memory reservation VM2 has a 2GHz CPU reservation and no Memory reservation VM3 has no CPU reservation and no Memory reservation . Given this information, what is the correct slot size for the cluster? ___
A. The CPU Reservation should be set to 32MHz and the memory reservation should be set to 32MB plus memory overhead.
B. The CPU reservation should be set to 1 GHz and the memory reservation should be set to 0MB plus memory overhead.
C. The CPU reservation should be set to 2 GHz, and the memory reservation should be set to 0MB plus the virtual machine memory overhead.
D. The CPU reservation should be set to 2 GHz, and the memory reservation should be set to 32MB, plus the virtual machine memory overhead.
【单选题】
An administrator is planning a vSphere infrastructure with the following specific networking requirements: <The ability to shape inbound (RX) traffic> <Support for Private VLANs (PVLANs)> <Support for LLDP (Link Layer Discovery Protocol)>. What is the minimum vSphere Edition that will support these requirements? ___
A. vSphere Essentials Plus
B. vSphere Standard
C. vSphere Enterprise
D. vSphere
E. nterprise Plus
【单选题】
When you add an ESXi 6.x host to a new Cluster, which vSphere object owns the CPU and Memory resources of the hosts? ___
A. vCenter Server
B. Datacenter
C. Cluster
D. Host
【单选题】
A user is trying to retrieve objects from a SharePoint server and finds the request is taking an excessive amount of time. An administrator tries to isolate the issue and notes the following: Application performance is poor when compared to virtual machines on other hosts. Performance improves when the virtual machine is moved to another host. The virtual machine encounters higher than expected CPU %Ready times. What conclusion can be reached regarding the performance issues for this virtual machine? ___
A. Host Power Management is directly impacting virtual machine performance.
B. The virtual machine has a large number of snapshots.
C. The Path Selection Policy for the storage device is set differently on the affected host.
D. Network I/O control is configured for the portgroup.
【单选题】
A virtual machine template is accidently removed from the vCenter Server Inventory. Which method would be used to recover the template back into the environment?___
A. Use the datastore browser to locate the template, then right click and add the .vmtx file to inventory.
B. Use the datastore browser to locate the template, then right click and add the .vmx file to inventory.
C. Using the Managed Object Browser and adding the template from the ManagedObjectReference:GuestFileManager object.
D. Using the Managed Object Browser and adding the template from the ManagedObjectReference:VirtualDiskManager object.
【单选题】
A vSphere administrator needs to backup a virtual machine that has a Microsoft SQL Server Database installed. Which solution allows for an application quiesce to occur during backup?___
A. VMware vCenter Converter
B. VMware vCenter Site Recovery Manager
C. VMware vSphere Replication
D. VMware vSphere Data Protection Advanced
【单选题】
An administrator is migrating a virtual machine from a Test cluster to a Production cluster. The two environments do not have any shared storage. What is the easiest way to accomplish this task? ___
A. Perform a Storage vMotion.
B. Perform a regular vMotion.
C. Perform a Virtual to Virtual migration.
D. Perform a backup and restore using VMware Data Protection.
【单选题】
An administrator must determine an appropriate backup solution, given these conditions: 50 of the virtual machines are in a resource pool named Finance. 50 of the virtual machines are in a resource pool named QA. Which solution allows an administrator the ability to backup 100 virtual machines? ___
A. Use Snapshot Manager on the vCenter Server to backup the virtual machines.
B. Use the VMware Consolidated Backup (vcb) tool on the ESXi Host to backup the virtual machines.
C. Use the VMware Data Recovery (VDR) Appliance on the vCenter Server to backup the virtual machines.
D. Use the VMware Data Protection (VDP) Appliance on one of the
E. SXi Hosts to backup the virtual machines.
【单选题】
What is a benefit of using Enhanced vMotion Compatibility for an environment? ___
A. EVC masks CPU features to allow compatibility between hosts that are dissimilar.
B. EVC allows for cross platform vMotion to occur.
C. EVC enables Long
D. istance vMotion.
【单选题】
How many Link Aggregation Groups (LAGs) can be configured on a vSphere 6.x Distributed Switch? ___
A. 64
B. 96
C. 128
D. 256
【单选题】
How many Link Aggregation Groups (LAGs) can be configured on a vSphere 6.x Distributed Switch? ___
A. 64
B. 96
C. 128
D. 256
【单选题】
An administrator needs to verify that vMotion operations can be performed in a vSphere data center.What round trip time (RTT) latency is the maximum value that will allow vMotion operations to succeed? ___
A. 50ms RTT
B. 100ms RTT
C. 150ms RTT
D. 200ms RTT
【单选题】
A storage administrator has reported that full utilization of all bandwidth from an ESXi 6.x host is not being seen. In troubleshooting the issue, the Adapter details are shown in the Exhibit. Based on the exhibit, what is cause of the issue? ___
A. The array is not setup to use the correct multipathing policy.
B. There are no virtual machines on the ESXi host.
C. Not all links are used because a path is disabled.
D. Another path needs to be configured.
【单选题】
An administrator is migrating a powered-on virtual machine, as shown in the exhibit. Which option should be selected to perform a Storage vMotion of the VM? ___
A. Change storage only
B. Change VM compute resource only
C. Change both compute resource and storage, changing the compute resource first.
D. Change both compute resource and storage, changing the storage resource first.
【单选题】
An administrator is attempting to enable Storage I/O Control on a datastore, but it is failing. What is the likely reason for this failure? ___
A. The host is connected to a datastore is running on ESX 4.0.
B. The host is connected to a Fibre Channel storage array.
C. The datastore has multiple extents.
D. The datastore is managed by a single vCenter Server.
【单选题】
A mission-critical virtual machine built on vSphere 4.1 needs to be moved to an ESXi 6.x host.Which virtual hardware version is needed to move the virtual machine without upgrading? ___
【单选题】
An administrator is analyzing a virtual machine as shown in the Exhibit. What is the current long term risk for this virtual machine? ___
A. The virtual machine may run out of memory before April 27.
B. The virtual machine may continue to function after April 27.
C. The virtual machine has adequate memory configured for operation for the next 120 days.
D. The virtual machine has adequate memory reservation configured for operation for the next 120 days.
【单选题】
An administrator is monitoring a High Availability (HA) and Distributed Resource Scheduler (DRS) enabled cluster and has noticed that virtual machines in the cluster are being migrated without user intervention. Why is this happening? ___
A. The DRS Automation level is set to Fully Automated.
B. The Automation level is set to Automatic.
C. The
D. PM Threshold is set to Aggressive.
【单选题】
An administrator attempts to migrate a suspended virtual machine to a newly deployed vSphere 6.x cluster. The compatibility check fails. What condition could cause this behavior?___
A. The new vSphere 6.x cluster is running Intel CPUs instead of AMD CPUs.
B. A suspended virtual machine cannot be migrated.
C. The hardware virtualization feature of the CPU is not enabled on the new hosts.
D. A vSphere Distributed Switch is required to migrate a suspended virtual machine.
【单选题】
A vSphere administrator has been using vSphere in evaluation mode and now wants to deploy an environment that provides the same features. Which edition of vSphere provides similar functionality to evaluation mode? ___
A. Enterprise Plus
B. Enterprise
C. Standard
D. Essentials
【单选题】
A vSphere administrator has been using vSphere in evaluation mode and now wants to deploy an environment that provides the same features. Which edition of vSphere provides similar functionality to evaluation mode? ___
A. Enterprise Plus
B. Enterprise
C. Standard
D. Essentials
【单选题】
An administrator has just configured the IP address on an ESXi host from the Direct Console User Interface. How can the configuration be validated as correct without any additional tools?___
A. Add the host to vCenter Server and if it works, then all networking settings are ok.
B. Select the Test Management Network option from the DCUI.
C. Connect to the host with the vSphere Client and click the Test Network option.
D. Use PowerCLI to connect to the host and initiate a network test.
【单选题】
An administrator is installing vCenter Server for an environment that has 40 ESXi 6.x Hosts and 150 virtual machines. Which database would meet the minimal requirements needed for this task? ___
A. vFabric Postgres
B. Microsoft SQL Express 2008
C. Microsoft SQL Server 2014
D. Oracle 11g
【单选题】
What is a requirement when enabling a Virtual SAN cluster in an existing High Availability (HA) and Distributed Resource Scheduler (DRS) Cluster? ___
A. Disable DRS and HA before enabling Virtual SAN
B. Enable DRS before enabling Virtual SAN
C. Disable HA before enabling Virtual SAN
D. Enable Storage DRS before enabling Virtual SAN
【单选题】
The vSphere administrator attempts to connect to an ESXi host via an SSH client and receives the following security alert: The vSphere administrator needs to determine whether the RSA key fingerprint shown in the security alert is the fingerprint of the intended ESXi host. Which tool should the vSphere administrator use? ___
A. Direct Console User Interface
B. vSphere Client
C. vSphere Web Client
D. vSphere Management Assistant
