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
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相关考题
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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 -
单项选择题
When two different metals are joined to form a closed circuit and exposed to different temperatures at their junctions （） which can be used to measure temperature.
A.a current will flow
B.a power will develop
C.a heat will flow
D.a pressure will produce
