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單項(xiàng)選擇題

An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.

A.aeration of the oil
B.contamination of the oil
C.pump cavitation
D.spongy actuator movements

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單項(xiàng)選擇題

A grease gun is generally used to lubricate a （）.

A.condensate pump ball bearing
B.main shaft bearing
C.main turbine bearing
D.diesel engine wrist pin bearing

單項(xiàng)選擇題

Thermostatic expansion valves can be adjusted for （）.

A.suction pressure only
B.head pressure only
C.superheat only
D.suction pressure and box temperature

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