【判断题】
碱度是指水中所含的能与强酸发生中和作用的全部物质,亦即能与氢离子相化合的物质总量。
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提高再生剂用量,可以提高树脂的再生程度,所以再生时,再生剂加得越多越好。
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当水的pH≥8.3时,表明天然水中不存在CO2。
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离子交换树脂受铁、铝及其氧化物污染后,颜色变深。
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使交换器内树脂重新具有交换能力的过程叫再生。
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混床再生混脂时一定要采用净化处理过的压缩风。
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离子交换树脂运行的交换容量是工作交换容量。
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混床离子交换树脂运行时树脂是均匀混合的。
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水中硬度分为碳酸盐硬度和非碳酸盐硬度。
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化学水处理的任务是通过必要的技术措施和工艺过程对不符合用户水质要求的水进行水质改善处理,以达到符合饮用要求。
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在用火作业过程中,当作业内容和条件发生变更时,应立即停止作业,“用火作业许可证”同时废止。
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冬季应选用黏度小、凝固点低的润滑油,夏季应选用黏度大的润滑油。
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如果脱盐水中进入CO2,水的电导率即会上升,腐蚀性增大。
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计量泵调节行程或者改变转速来调节流量。
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离心泵工作时,管路堵塞会引起电机超负荷。
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强碱阴离子交换树脂的最高可耐受温度是60℃。
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天然水中化学需氧量越大,说明其受到无机物污染越严重。
【判断题】
所谓的水的纯度是指水的清净程度,可用水中各种悬浮物和胶体等杂质的总含量来衡量。
【判断题】
止回阀一般用于清净的流体介质中,不宜用于含固体颗粒和黏度大的流体介质。
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化学水处理站和凝结水处理站均设置5台混床设备。
【判断题】
为了便于检修,止回阀一般安装在水泵和出口阀之间。
【判断题】
胶体物质也可由大颗粒的难溶物质破碎后而形成。
【判断题】
离心泵的二级保养周期为运行168小时。
【判断题】
化学水处理站的设计处理规模为1000t/h。
【判断题】
由于凝结水处理站的制水量受外界因素影响较大,因此装置主要依靠调节化学水处理站的运行负荷确保外供除盐水量满足全厂使用要求。
【判断题】
凝结水处理站回收的凝液包括工艺冷凝液和透平冷凝液。
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化学水处理站和凝结水处理站均设有高效过滤器。
【判断题】
正常情况下,凝结水处理站的进水水质优于化学水处理站。
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判断蒸汽凝液是否具备回收条件的关键水质指标是含油量和TOC。
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逆流再生时,中间配水装置以上的树脂也起离子交换作用。
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阳离子交换器失效,会出现电导率暂时上升现象。
【判断题】
水泵运行时,叶轮两侧承受的压力不平衡,是产生轴向推力的主要原因。
【判断题】
进水的含盐量和树脂的再生程度对混床的出水水质和运行周期都有很大影响。
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离心泵出口阀开度变小则泵的流量下降,电流下降。
【判断题】
化学水装置的混床再生时,阴阳离子交换树脂呈混合状态。
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46.天基武器系统主要指攻击对方航天器用的卫星和卫星平台,包括 ___ 、 ___和___ 等。
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48.新概念武器主要有 ___ 、___、 ___ 、 ___ 、___ 等。
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49.核武器具有____、冲击波、____ ___、核电磁脉冲和放射性沾染等五种杀伤破坏因素。
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50.精确制导技术是指采用高技术直接命中概率超过___以上的武器。
【单选题】
What is an example of social engineering?___
A. gaining access to a computer by observing the user login credentials
B. gaining access to a build through an unguarded entrance
C. gaining access to a server by using a USB stick
D. gaining access to a server room by posing as local IT
【单选题】
Which type of Layer 2 attack enables the attacker to intercept traffic that is intended for one specific recipient?___
A. BPDU attack
B. DHCP starvation I LAB
C. MAC address spoofing
D. CAM table overflow
【单选题】
Which about nested policy maps in a zone-based firewall is true ?___
A. They are limited to two leve ls in a hierarchical policy
B. Parent policies are previously defined policies that are defined by using the service policy command
C. A child policy is a new policy that uses a pre-existing policy.
D. A child policy is a new that uses a pre-existing policy
【单选题】
In which configuration do you configure the ip ospf authentication key 1 command?___
A. routing process
B. interface
C. privileged
D. global
【单选题】
Which statement about command authorization and security contexts is true?___
A. If command authorization is configured, it must be enabled on all contexts.
B. The change to command invokes a new context session with the credentials of the currently
C. AAA settings are applied on a per-context basis
D. The enable. 15 user ang admins with chang to permission ha e dfferent command authorization levels pertontext
【单选题】
Which command do you enter to enable authentication for OSPF on an interface?___
A. router(config-if)#ip ospf message-digest-key 1 md5 CIS COPASS
B. router(config-if)#ip ospf authentication message-digest
C. router(config-if)#ip ospf authentication-key CISCOPASS
D. router(config-if)#area 0 authentication message-digest
【单选题】
What feature defines a campus area network?___
A. It has a single geographic location
B. It lacks external connectivity.
C. It has a limited number of segments.
D. It has limited or restricted Internet access
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Which type of attack most commonly involves a direct attack on a network?___
A. :phishing
B. Trojan horse
C. denial of service
D. social engineering
【单选题】
What information does the key length provide in an encryption algorithm?___
A. the cipher block size
B. the hash bloc k size
C. the number of permutations
D. the packet size
【单选题】
How do you verify TaCACS+ connectivity to a device?___
A. You successfully log in to the device by using the local credentials
B. You connect via console port and receive the login prompt.
C. You connect to the device using SSH and receive the login prompt.
D. You successfully log in to the device by using ACS credentials
【单选题】
Which term best describes the concept of preventing the modification of data in transit and in storage?___
A. availability
B. confidentially
C. fidelity
D. integrity
【单选题】
Which loS command is used to define the authentication key for ntp?___
A. switch(config )#ntp authentication-key 1 mds Clcs
B. switch(config )#ntp authenticate
C. switch(config)#ntp trusted-key 1
D. switch(config)#ntp source 192.168.0.1
【单选题】
What is true about the cisco lOS Resilient Configuration feature ?___
A. The feature can be disabled through a remote session
B. There is additional space required to secure the primary cisco lOS image file.
C. The feature automatically detects image or configuration version mismatch.
D. Remote storage is used for securing files
【单选题】
When is the default deny all policy an exception in zone-based firewalls?___
A. when traffic terminates on the router via the self zone
B. when traffic traverses two interfaces in different zones
C. when traffic traverses two interfaces in the same zone
D. when traffic sources from the router via the self zone
【单选题】
.If an access port is assigned as an isolated port in a PVLAN, which network ports can it communicate with?___
A. promiscuous ports in the same PLVAN
B. isolated ports in the same PVLAN
C. all ports in the same PAVLAN at ILAR
D. all ports in the adjacent PVLAN
【单选题】
Which IPSEC mode is used to encypt traffic directly between a client and a server VPN endpoint?___
A. quick mode
B. transport mode
C. aggressive mode
D. tunnel mode
【单选题】
Which command do you enter to verify that a vpn connection is established between two endpoints and that the connection is passing traffic? ___
A. Firewall#sh crypto session
B. Firewall#debug crypto isakmp
C. Firewall#tsh crypto ipsec sa
D. Firewall#sh crypto isakmp sa
【单选题】
which type of Pvlan port allows communication from all port types?___
A. isolated
B. in -line
C. community
D. promiscuous
【单选题】
Which command do you enter to configure your firewall to conceal internal addresses?___
A. no ip directed-broadcast
B. no ip logging facility
C. no proxy-arp
D. no ip inspect audit-trial
E. no ip inspect
F. route
【单选题】
Which feature defines a campus area network? ___
A. It has a limited number of segments.
B. It has limited or restricted Internet access
C. It lacks ex1ternal connectivity.
D. It has a single geographic location
【单选题】
What technology can you use to provide data confidentiality data integrity and data origin authentication on your network?___
A. IPSec
B. Certificate Authority
C. IKE
D. Data
E. ncryption Standards
【单选题】
which standard is a hybrid protocol that uses oakley and skerne ke y exchanges is an ISAKMP framework?___
【单选题】
What is the actual los privilege level of User Exec mode?___
【单选题】
What is the effect of the asa command crypto isakmp nat-traversal?___
A. It opens port 500 only on the out side interface
B. It opens port 500 only on the inside interface
C. It opens port 4500 on all interfaces that are IPSec enabled
D. It opens port 4500 only on the out side interfac
【单选题】
Which Fire POWER preproce ssor engine is used to prevent SYN attacks?___
A. Inline normalization
B. IP Defragmentation
C. Ports can
D. etection
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Which NAT type allows objects or groups to reference an IP address ?___
A. identity NAt
B. static NAT
C. dynamic
D. dynamic NAT
【单选题】
Which Auto NAT policies are processed first?___
A. Dynamic NAT with longest prefix
B. Dynamic NAT with shortest prefix
C. static NAT with longest prefix
D. static NAT with shortest prefix
【单选题】
Which feature allows a dynamic Pat pool to se lect the next address in the pat pool instead of the next port of an existing address?___
A. next IP
B. round robin
C. dynamic rotation
D. NAT address rotation