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
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1.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
2.單項(xiàng)選擇題The （） belongs to the mooring equipment.
A.steering gear
B.windlass
C.deck crane
D.warping drum
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