單項選擇題Heat energy is a source of power, but （） will cause damage to the engine.
A.excessive heat
B.insufficient heat
C.effective cooling
D.high output
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1.單項選擇題Head tank should be used to remove （） from cooling water.
A.scale
B.sludge
C.chemicals
D.air
2.單項選擇題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
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