单项选择题
A.a manual closed loop B.a manual opened loop C.an automatic closed loop D.an automatic opened loop
Bourdon Tube is probably the most commonly used （） meas...
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
Movement of the diaphragm or bellows is （） by a linkage...
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
When two different metals are joined to form a closed c...
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
