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單項(xiàng)選擇題

In a direct expansion type multi-box refrigeration system, the compressor is set up to cycle on and off by the（）

A.pressurestat
B.high pressure cutout
C.solenoid valve
D.low pressure cutout switch

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單項(xiàng)選擇題

The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as（）

A.opposing operational drag
B.pressure distribution
C.differential
D.system purge

單項(xiàng)選擇題

A fluid coil will （）large quantities of heat when it changes state from a liquid to a vapor.

A.release
B.absorb
C.develop
D.regenerate

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