营养水平 nutritional level

两台相邻路由器运行IS-IS协议，它们处于相同区域，通过Serial0接口相连，采用缺省配置，如果只想建立Level-1的邻接关系，可以通过以下哪些命令实现（）。

A:[RTA-isis-1]is-level level-1 B:[RTA-Serial0]isis dis-priority 1 level-1 C:[RTA-Serial0]isis circuit-level level-1 D:[RTA-Serial0]isis cost 1 level-1

商品运输包装上的“explosive”属于（）。

A:警告性标志 B:指示性标志 C:唛头 D:危险性标志

Domestic water pump is started automatically by _____ which operates as the water level falls to a predetermined level.

A:a level controller B:a temperature switch C:a pressure switch D:a floating ball

If both the "high level" and "low level" alarms come on for the same address of a centralized control console, the most likely problem is a/an _____.

A:sensor failure B:failed alarm C:low level D:extremely high level

______ means the level for which minimum appropriate protective security measures shall be maintained at all times, threats and exchanging such information with appropriate Contracting Governments.

A:Security level 1 B:Security level 2 C:Security level 3 D:Lowest safety level

When required to work where there may be explosive gases, you should use tools which are .

A:approved by the Coast Guard B:high carbon steel C:fixed with a ferrous cover D:nonsparking

What is the meaning of UEL?

A:Upper exposure leve B:Upper explosion level C:Upper explosive leve D:Upper evaporation level"

A fuel-air mixture below the lower explosive limit is too ______．

A:rich to burn B:lean to burn C:cool to burn D:dense to burn"

What is the meaning of UEL?

A:Upper exposure level B:Upper explosion level C:Upper explosive level D:Upper evaporation level"