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單項選擇題

Increasing the moisture content of conditioned air is known as （）.

A.moisturizing
B.dehumidification
C.dampening
D.humidification

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單項選擇題

A reciprocating air compressor is running roughly and vibrating excessively, indicating that the （）.

A.compressor is overloaded
B.motor is overloaded
C.foundation bolts are loose
D.belts are too tight

單項選擇題

The term "pour point" is defined as the lowest temperature at which lubricating oils will flow （）.

A.rapidly
B.by gravity
C.through a standard orifice at a specified temperature
D.at a rate of 60cc per second

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