單項選擇題

The color of the flame on a halide torch without any refrigerant present is （）.

A.blue
B.green
C.orange
D.purple

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單項選擇題

If a refrigeration compressor is running continuously without lowering temperature as normal in the refrigerator, the trouble may be （）.

A.excessive condenser cooling water
B.warm food in the refrigerator
C.a shortage of refrigerant
D.s shortage of compressor oil

單項選擇題

Thermostatic expansion valve are （）.

A.either all the way open or all the way closed
B.normally open
C.throttled depending on load
D.controlled by suction pressure

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