单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
