单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

Restrictions occurring in the small orifices of pneumatic control system components can be used by （）

A.moisture in the compressed air supply
B.excessive dryness in the compressed air supply
C.pressure surging in the compressed air receiver
D.insufficient lubrication of the system components