單項(xiàng)選擇題The air compressor pumps air to the （）.
A.air cylinder
B.combustion chamber
C.steam drum
D.expansion tank
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1.單項(xiàng)選擇題The （） stage air compressors are widely used on board the ship.
A.single
B.Ⅱ
C.Ⅲ
D.multiple
2.單項(xiàng)選擇題The air filter is fixed in the （） of an air compressor.
A.inlet pipe
B.outlet pipe
C.inter cooler
D.after cooler
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