單項(xiàng)選擇題Head tank should be used to remove （） from cooling water.
A.scale
B.sludge
C.chemicals
D.air
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1.單項(xiàng)選擇題He said that he had turned the main engine one complete revolution with the （）.
A.turning gear
B.steering gear
C.spur gear
D.chain gear
2.單項(xiàng)選擇題Generally the gudgeon pin is fully floating in both connecting rod small end and （）.
A.the crosshead
B.the crankshaft
C.large end
D.the piston bosses
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