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單項選擇題

In （） the control action is independent on(of) the output.

A.a closed loop control system
B.an open loop control system
C.a boiler control system
D.a steering gear control system

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單項選擇題

This arrangement is （） if the elements are directly connected to one another and the control action takes place without human involvement.

A.a manual closed loop
B.a manual opened loop
C.an automatic closed loop
D.an automatic opened loop

單項選擇題

Bourdon Tube is probably the most commonly used （） measuring instrument.

A.the absolute pressure
B.the gauge pressure
C.the vacuum pressure
D.the differential pressure