單項(xiàng)選擇題

The mode of control employed by an alarm circuit is a （）

A.two position control
B.signal speed floating control
C.proportional speed floating control
D.reset control

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單項(xiàng)選擇題

The meat box temperature control circuit, as used in ship service refrigeration system, is an example of （）

A.two position control
B.signal speed floating control
C.proportional control
D.reset control

單項(xiàng)選擇題

The two most common gases used in pneumatic system are （）

A.compressed air and nitrogen
B.helium and nitrogen
C.oxygen and hydrogen
D.oxygen and acetylene

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