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單項(xiàng)選擇題

Prior to running the hydraulic pump, examine the system carefully and ensure that the lever of control valves is in （） position.

A.neutral
B.end
C.opening
D.closure

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A.windlasses
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單項(xiàng)選擇題

Grease the roller bearings with HPgun In the sentence “HP” means （）.

A.horse power
B.high pressure compressor
C.hand pump
D.high pressure

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