A.is usual
B.is not usual
C.is necessary
D.is not impossible
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A.protective earth
B.isolators
C.ground switch
D.circuit-breakers
A.a closed loop control system
B.an open loop control system
C.a boiler control system
D.a steering gear control system
A.a manual closed loop
B.a manual opened loop
C.an automatic closed loop
D.an automatic opened loop
A.the absolute pressure
B.the gauge pressure
C.the vacuum pressure
D.the differential pressure
A.measured
B.recorded
C.transferred
D.controlled
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（） is not installed on the main switchboar.
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