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【单选题】

Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.

A、toxic

B、flammable

C、explosive

D、all of the above

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更多“Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.”相关的问题
第1题
[单选题] Rewrite rules are used in which CoS scenario?（）

A、When a single device is configured to provide differentiated services.  B、When multiple devices in a network are configured to use CoS to provide differentiated services.  C、When a device is used to connect to another autonomous system.  D、When CoS is used to classifiy traffic as low priority.  

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第2题
[单选题] When using slings，cargo handlers should take all the following precautions except（）.

A、Ensure that slings are securely fastened around the load  B、Avoid careless winch operations，especially when handling fragile cargo  C、Exercise care when using hooks，crowbars，and similar tools  D、Keep the loads as close to the rail or deck as possible  

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第3题
[单选题] Which statement concerning the lashings of containers with solid bar or wire rope lashings is TRUE? （）

A、Stack weights should be less when using a solid bar lashing as compared to a wire lashing  B、Stack heights may be increased when using a solid bar lashing  C、Stack heights should be reduced when using a solid bar lashing  D、Solid bars should be used for lashing the first tier only，with wire lashings on the higher tier(s)  

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第4题
[填空题] When we teach grammar as（）, the learner is required to attend to grammar, while working on tasks which retain an emphasis on language use.

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第5题
[单选题] When implementing BGP confederations, which configuration command establishes the globally unique AS number used with external peers outside your network?（）

A、bgp confederation as  B、bgp confederation system  C、bgp confederation remote-as  D、bgp confederation identifier  

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第6题
[] The required fireman’s outfits required for ship’s are not to be used for any other purpose EXCEPT for the（）.

A、A.oxygen and explosion meter when it is used for detection of flare gases  B、B.self-contained breathing apparatus，when used as protection from gas leaking from a refrigeration unit  C、C.boots and gloves that are made of rubber or electrically non-conductive material，if used when repairing electrical equipment  D、D.lifeline，if used by personnel entering a compartment which might be deficient of oxygen  

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第7题
[多选题] In which three ways are C-BGP and E-BGP sessions similar?（）

A、Both are configured as type external.  B、Both configurations use the peer-as command.  C、Neither advertises the local-preference attribute.  D、Both set next-hop self when advertising routes to peers.  E、Both modify the AS-path attribute when advertising routes.  

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第8题
[单选题] You work as the application developer at Certkiller .com. Certkiller .com uses Visual Studio.NET 2005 as its application development platform. You are developing a Windows Service application which contains three different Windows services. You are required to only set one Windows service to start automatically when the system is restarted. What should you do?（）

A、Use the ServiceController class.  B、Use the ServiceBase class.  C、Use the ServiceProcessInstaller class.  D、Use the ServiceInstaller class.  

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第9题
[单选题] When EIGRP is used as the PE-CE routing protocol which of these statements is correct?（）

A、EIGRP can be used only as the PE-CE routing protocol if the PE and CE routers are in the same AS  B、Other EIGRP AS routes are automatically advertised to the CE router and do not require a redistribution configuration command to be configured  C、Unlike other routing protocols that are used between PE and CE routers, EIGRP supports backdoor links  D、Configure of the VPN is only required on the PE router  

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