單項選擇題The air compressor pumps air to the （）.
A.expansion tank
B.combustion chamber
C.air receiver
D.evaporator
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1.單項選擇題The air compressor pumps air to the （）.
A.air cylinder
B.combustion chamber
C.steam drum
D.expansion tank
2.單項選擇題The （） stage air compressors are widely used on board the ship.
A.single
B.Ⅱ
C.Ⅲ
D.multiple
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