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單項(xiàng)選擇題

In a compression refrigeration plant the hot, high pressure refrigerant gas is cooled by the sea water and becomes liquid in the （）.

A.compressor
B.condenser
C.throttle valve
D.evaporator

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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

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)

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