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單項選擇題

Open the （）before starting an air compressor.

A.unload valve
B.cooling water
C.oil cup
D.sump

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單項選擇題

Supply the （）before starting an air compressor.

A.fuel oil
B.cooling water
C.steam
D.power

單項選擇題

During working of an air compressor, （） should be drained.

A.oil sump
B.oil separator
C.outlet pipe
D.inlet pipe

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