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單項(xiàng)選擇題

Hydraulic pumps most commonly used in steering systems are of the （）.

A.lobe type
B.screw type
C.axial piston type
D.volute type

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單項(xiàng)選擇題

When an auxiliary boiler is panting and emitting black smoke, you should （）.

A.increase the fuel oil temperature
B.decrease the fuel oil temperature
C.decrease the fuel oil supply pressure
D.increase the air supply

單項(xiàng)選擇題

Close the （）.

A.keyway
B.shaft
C.packing
D.valve

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