單項(xiàng)選擇題

If the discharge valves on a refrigeration compressor are leaking badly, the compressor should （）.

A.run continuously
B.not start
C.have high discharge pressure
D.short cycle on the high pressure switch

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單項(xiàng)選擇題

Which of the following terms could be applied to the simple definition the energy of motion?（）

A.Electrical energy
B.Thermal energy
C.Potential energy
D.Kinetic energy

單項(xiàng)選擇題

The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the （）.

A.sliding block
B.pintle
C.reaction ring
D.tilting box or swash plate