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單項(xiàng)選擇題

The latent heat of water vapor in air is dependent upon the （）

A.dry bulb temperature
B.wet bulb temperature
C.dew point
D.dry point

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單項(xiàng)選擇題

If you find an extremely large refrigerant leak while using a halide torch, your flame will（）

A.change from blue to orange
B.‘flare up’ and remain lighted
C.probably go out
D.stay blue

單項(xiàng)選擇題

Before charging a refrigeration unit, the refrigerant charging lines should be（）

A.flushed with clean refrigerant oil
B.purged with the refrigerant
C.washed with an ammonia and alcohol solution
D.grounded to compressor

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