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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

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單項(xiàng)選擇題

Badly leaking refrigeration compressor discharge valves will cause（）.

A.overfeeding of the expansion valve
B.damage to the condenser
C.constant running of the compressor
D.flooding of the receiver

單項(xiàng)選擇題

Mechanical energy in transition is referred to as （）.

A.horsepower
B.work
C.heat
D.velocity

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