A.short proof
B.ground proof
C.explosion proof
D.overload proof
您可能感興趣的試卷
你可能感興趣的試題
A.prime mover speed
B.exciter output voltage
C.load on the alternator
D.number of poles
A.shunt field
B.circuit breaker
C.metal framework
D.inter-pole
A.brushes
B.slip rings
C.commutators
D.all of the above
A.is usual
B.is not usual
C.is necessary
D.is not impossible
A.protective earth
B.isolators
C.ground switch
D.circuit-breakers
最新試題
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
Which of the following items don’t belong to dock repair works?（）
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
The ISPS Code consists of a mandatory section-Part A, which shows（）
The condensers located in various stages of a flash evaporator are cooled by（）
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）
If separating effect is not good, which measure should be taken （）