A.sub-boards
B.main switchboards
C.emergency switchboards
D.distribution boards
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A.check for respiration
B.check for pulse
C.treat for shock
D.All of the above
A.plastic
B.metal
C.stainless steel
D.copper
A.turn off power first
B.turn on power first
C.with a test pen in hand
D.tell C/E
A.ammeter
B.voltmeter
C.synchroscope
D.A+B+C
A.either；or
B.neither；nor
C.such；that
D.so；that
最新試題
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）
When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish
To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
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