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單項(xiàng)選擇題

A manometer is used to measure （）.

A.pressure
B.temperature
C.volume
D.specific gravity

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單項(xiàng)選擇題

"gauge pressure" means（）.

A."vacuum"
B."the excess of pressure above atmosphere"
C."figure on a gauge"
D.Any of the above

單項(xiàng)選擇題

The （） is used to measure the volume of a liquid or gas through a pipeline within any given period of time.

A.flowmeter
B.viscometer
C.micrometer
D.feeler

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