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

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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
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To parallel an incoming machine to a running machine therefore it is necessary to ensure firstly that （）.

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