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單項選擇題

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

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單項選擇題

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

單項選擇題

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