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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

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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

單項選擇題

Movement of the diaphragm or bellows is （） by a linkage to a needle or pointer display to indicate the differential pressure between two sides of the diaphragm or bellows.

A.measured
B.recorded
C.transferred
D.controlled

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