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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

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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

單項選擇題

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

A.inter cooler
B.cylinder
C.outlet pipe
D.inlet pipe