【判断题】
[31]当胺吸收塔压降增加明显时，说明胺洗液起泡了
查看试卷，进入试卷练习
微信扫一扫，开始刷题
相关试题
【判断题】
[34]乙烯精馏塔的任务是将乙烯和乙炔分开
【判断题】
[35]制冷的目的是将热量自高温物质传递给低温物质
【判断题】
[38]当冷却水中断，由于乙烯冷剂压缩机系统不用冷却水，故可以不停车
【判断题】
[39]输送10℃以下的液体的泵为低温泵
【判断题】
[40]真空度低将造成裂解气压缩机联锁动作
【判断题】
[41]塔系统的操作与调整应遵循灵敏板温度相
【判断题】
[42]废碱中盐的总含量应低于20%，以防止盐从溶液中结晶析出
【判断题】
[44]膨胀机的工作过程是一个降压过程又是一个增压过程，只是增降压幅度不同
【判断题】
[45]由于流体蒸发时温度降低，它要从周围的物体，吸收热量，因此液体蒸发有致冷作用
【判断题】
[46]温度越低，表明物体内部分子运动越剧烈
【判断题】
[48]制冷系统受轻组分污染后压缩机排出压力会增加
【判断题】
[50]泡沫灭火器不能用于扑救油类火灾
【判断题】
[52]危急保安器动作后，转速可在任何情况下进行机组复位
【判断题】
[55]启动透平器，先应建立复水循环，后建立真空
【判断题】
[59]屏蔽泵抽承磨损后若不处理将导致屏蔽泵损坏
【判断题】
[61]裂解气中二氧化碳的主要裂解炉反应区的结碳和水蒸汽发生水合反应区形成的
【判断题】
[62]当压缩机吸入流量一定时，若入口压力增加，则出口压力也增加
【判断题】
[67]膨胀和制冷是等焓膨胀过程节流膨胀是等熵膨胀过程
【判断题】
[68]当压缩机排出压力一定时，吸入压力增加，则说明气流量增加了
【判断题】
[73]分子筛是一种人工合成的水合硅酸盐晶体
【判断题】
[74]干燥剂再生时用氮气和CH4作载气，是因为氮气和CH4气体分子小，且极为性分子
【判断题】
[75]为节约能量，乙烯精馏塔在提馏段设置中间再沸
【判断题】
[77]逆可诺循环是一种理想的制冷循环
【判断题】
[85]离心泵一般转速为1450转/分或2950转/分
【判断题】
[86]紧急情况下可打开手操器向燃料气罐补充燃料气
【判断题】
[87]往复压缩机压力范围广，从低压到超高压范围都适用，而离心式压缩机
【判断题】
[89]产品乙烯送出装置的压力和流量变化，
【判断题】
[91]设备打开检修前，必须要经过倒空置换，加盲板、鼓风等安全措施
【判断题】
[93]要减少乙烯损失，必须控制好分馏分凝器顶部温度
【判断题】
[94]新鲜碱中含有Fe和氧气将增加聚合物的形成
【判断题】
[95]若精馏操作不正常，引起塔顶产品中重组分浓度增加时，可采用适当提高操作压力的办法，使产品质量合格
【判断题】
[99]丙烯的爆炸极限为2.7～36%
【判断题】
[101]当裂解气负荷变化时，最经济的控制方法是调节压缩机的转速
【判断题】
[102]饱和蒸汽压的大小只与体系的温度有关，而与其他因素无关
【判断题】
[103]碱洗塔只是除去酸性气体的有机硫
推荐试题
【单选题】
Which feature prevents loops by moving a nontrunking port into an errdisable state when a BPDU is received on that port？___
A. BPDU filte
B. DHCP snooping
C. BPDU guard
D. Port Fast
【单选题】
Which command enables port security to use sticky MAC addresses on a switch？___
A. switchport port-security violation restrict
B. switchport port-security mac-address sticky
C. switchport port-security violation protect
D. switchport port-security
【单选题】
When you edit an IPS subsignature， what is the effect on the parent signature and the family of subsignatures？___
A. The change applies to the parent signature and the entire family of subsignatures
B. The change applies to the parent signature and the subsignature that you edit
C. The change applies only to subsignatures that are numbered sequentially after the subsignature that you edit
D. Other signatures are unaffected， the change applies only to the subsignature that you dit
【单选题】
Which type of mechanism does Cisco FirePOWER de ploy to protect ag detected moving across other networks？___
A. antivirus scanning
B. policy-based
C. reputation-based
D. signature-based
【单选题】
What action must you take on the ise to blacklist a wired device？___
A. Locate the switch through which the device is connected and push an a cl restricting all access by the device
B. Issue a CoA request for the de vice's mac address to each access switch in the network
C. Revoke the device's certificate so it is unable to authenticate to the network
D. Add the device's MAc address to a list of black listed devices
【单选题】
Which type of firewall can perform deep packet inspection？___
A. packet-filtering firewall
B. stateless firewall
C. application firewall
D. personal firewall
【单选题】
What is the main purpose of Control Plane Policing？___
A. to prevent exhaustion of route-proce ssor resources
B. to organize the egress packet queues
C. to define traffic classes
D. to maintain the policy map
【单选题】
Which attack can be prevented by OSPF authentication？___
A. smurf attack
B. IP spoofing attack
C. denial of service attack
D. buffer overflow attack
【单选题】
What is the best definition of hairpinning？___
A. ingress traffic that traverses the outbound interface on a device
B. traffic that enters one interface on a device and that exits through another interface
C. traffic that enters and exits a device through the same interface
D. traffic that tunnels through a device interface
【单选题】
Which SNMPv3 security level provides authentication using HMAC with MD5， but does not use encryption？___
A. authPriv
B. authNo Priv
C. noAuthNoPriv
D. NoauthPriv
【单选题】
You have implemented a dynamic blacklist， using security intelligence to block illicit network activity. However， the blacklist contains several approved connections that users must access for usiness pur poses. Which action can you take to retain the blacklist while allowing users to access the approve d sites？___
A. Create a whitelist and manually add the approved addresses.
B. Disable the dynamic blacklist and deny the specif ic address on a whitelist while permitting the others
C. Edit the dynamic blacklist to remove the approved addresses
D. Disable the dynamic blacklist and create a static blacklist in its place
【单选题】
When connecting to an external resource,you must change a source IP address to use one IP address from a range of 207.165.201.1 to 207.165.1.30. Which option do you implement ?___
A. dynamic source NAT that uses an IP ad dress as a mapped source
B. static destination NAT that uses a subnet as a real de stination
C. dynamic source NAT that uses a range as a mapped source
D. static destination NAT that uses a subnet as a real source
【单选题】
Refer to the exhibit. 【nat（ins，any）dynamic interface】Which ty pe of NaT is configured on a Cisco ASA？___
A. dynamic NAT
B. source identity NAT
C. dynamic PAT
D. identity twice NAT
【单选题】
Which mitigation technology for web-based threats prevents the removal of confidential data from the network？___
A. CTA
B. DCA
C. AMP
D. DLP
【单选题】
Refer to the exhibit. What is the effect of the given configuration？___
A. It establishes the preshared key for the switch
B. It establishes the preshared key for the firewall.
C. It establishes the preshared key for the Cisco ISE appliance
D. It establishes the preshared key for the router.
【多选题】
What are two major considerations when choosing between a SPAN and a TAP when plementing IPS？___
A. the type of analysis the iS will perform
B. the amount of bandwidth available
C. whether RX and TX signals will use separate ports
D. the way in which media errors will be handled
E. the way in which dropped packets will be handled
【多选题】
What are two direct-to-tower methods for redirecting web traffic to Cisco Cloud Web Security？___
A. third-party proxies
B. Cisco Catalyst platforms
C. Cisco NAC Agent
D. hosted PAC files
E. CiSco ISE
【多选题】
Which three descriptions of RADIUS are true？ ___
A. It uses TCP as its transport protocol.
B. Only the password is encrypted
C. It supports multiple transport protocols
D. It uses UDP as its transport protocol
E. It combines authentication and authorization
F. It separates authentication，authorization，and accounting
【多选题】
Which two configurations can prevent VLAN hopping attack from attackers at VLAN 10？___
A. using switchport trunk native vlan 10 command on trunk ports
B. enabling BPDU guard on all access ports
C. creating VLAN 99 and using switchport trunk native vlan 99 command on trunk ports
D. applying ACl between VLAN
E. using switchport mode access command on all host ports
F. using switchport nonegotiate command on dynamic desirable ports
【多选题】
What are two features of transparent firewall mode ___
A. It conceals the presence of the firewall from attackers
B. It allows some traffic that is blocked in routed mode
C. It enables the aSA to perform as a router.
D. It acts as a routed hop in the network.
E. It is configured by default
【多选题】
Which two models of A sa tend to be used in a data center？___
A. 5555X
B. 5585X
C. ASA service module
D. 5512X
E. 5540
F. 5520
【多选题】
Which two statements about hardware-based encrption are true？___
A. It is widely accessible
B. It is potentially easier to compromise than software-based encryption. It requires minimal configuration
C. It requires minimal configuration
D. It can be implemented without impacting performance
E. It is highly cost-effective
【多选题】
In which two modes can the Cisco We b Security appliance be de ployed？___
A. as a transparent proxy using the Secure Sockets Layer protocol
B. as a transparent proxy using the Web Cache Communication Protocol
C. explicit proxy mode
D. as a transparent proxy using the Hyper Text Transfer Protocol
E. explicit active mode
【单选题】
1．三相刀开关的图形符号与交流接触器的主触点符号是___。
A. 一样的
B. 可以互换
C. 有区别的
D. 没有区别
【单选题】
5．熔断器的作用是___。
A. 短路保护
B. 过载保护
C. 失压保护
D. 零压保护
【单选题】
6．热继电器的作用是___。
A. 短路保护
B. 过载保护
C. 失压保护
D. 零压保护
【单选题】
7．交流接触器的作用是可以___接通和断开负载。
【单选题】
8．三相异步电动机的启停控制线路由电源开关、熔断器、___、热继电器、按钮等组成。
A. 时间继电器
B. 速度继电器
C. 交流接触器
D. 漏电保护器
【单选题】
9．三相异步电动机的启停控制线路中需要有___、过载保护和失压保护功能。
A. 短路保护
B. 超速保护
C. 失磁保护
D. 零速保护
【单选题】
10维修电工以___、安装接线图和平面布置图最为重要。
A. 电气原理图
B. 电气设备图
C. 电气安装图
D. 电气组装图
【单选题】
11．熔断器的额定电压应___线路的工作电压。
A. 远大于
B. 不等于
C. 小于等于
D. 大于等于
【单选题】
12．对于电阻性负载，熔断器熔体的额定电流___线路的工作电流。
A. 远大于
B. 不等于
C. 等于或略大于
D. 等于或略小于
【单选题】
13．对于电动机负载，熔断器熔体的额定电流应选电动机额定电流的___倍。
A. 1~1.5
B. 1.5-2.5
C. 2.0~3.0
D. 2.5~3．5
【单选题】
14．使用快速熔断器时，一般按___来选择。
A. IN=1.03IF
B. IN=1.57IF
C. IN=2.57IF
D. IN=3IF
【单选题】
15.断路器中过电流脱扣器的额定电流应该大于等于线路的___。
A. 最大允许电流
B. 最大过载电流
C. 最大负载电流
D. 最大短路电流
【单选题】
16．短路电流很大的电气线路中宜选用___断路器。
A. 塑壳式
B. 限流型
C. 框架式
D. 直流快速
【单选题】
17．一般电气控制系统中宜选用___断路器。
A. 塑壳式
B. 限流型
C. 框架式
D. 直流快速
