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單項(xiàng)選擇題

Open the （）of inter cooler before starting an air compressor.

A.cylinder cover
B.cooling water
C.oil cup
D.drain valve

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單項(xiàng)選擇題

Open the （）before starting an air compressor.

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

單項(xiàng)選擇題

Supply the （）before starting an air compressor.

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