单项选择题

The sensible heat of air is dependent upon the （）.

A.dry bulb temperature
B.wet bulb temperature
C.saturation temperature
D.water vapor superheat

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Which of the devices listed, when used on an electro-hydraulic steering gear, keeps the movement of the redder closely in step with the steering wheel?（）

A.The follow-up gear
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A multistage centrifugal pump can be BEST described as having （）.

A.two or more impellers housed together in one casing and mounted on a single shaft
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