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單項(xiàng)選擇題

In the （） refrigeration compressor one end of the crank shaft extends through the crankcase house for connection, via a coupling or pulley, to an external drive motor.

A.open-type
B.hermetic
C.semi-hermetic
D.all the above

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單項(xiàng)選擇題

Which of the following will be desirable properties of refrigerant?（）
(1) non-explosive
(2) non-corrosive
(3) that it doesn’t react with lubricants

A.(1), (2) and (3)
B.(1) and (2)
C.(1) and (3)
D.(2) and (3)

單項(xiàng)選擇題

In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the evaporator is slightly （）.

A.saturated
B.super-cooled
C.wet
D.superheated

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