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單項選擇題

In a compression refrigeration plant the refrigerant flows from the expansion valve and through the （） where it absorbs heat from the space being cooled and becomes a gas or vapor.

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

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單項選擇題

Since heat will not flow freely from a body at a （） temperature to another at a （） temperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.

A.lower；higher
B.shallower；deeper
C.larger；smaller
D.higher；lower

單項選擇題

In the process of （）, liquid changes into gas.

A.evaporation
B.frosting
C.condensing
D.compressing