單項選擇題Too much excess air is （）because the heat generated is being lost through the exhaust trunking instead of being made used of in heating the water to produce steam.
A.not good
B.good
C.better
D.the best
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1.單項選擇題（） the oxygen content in the exhaust gas, （） the combustion is.
A.The lower；the worse
B.The higher；the better
C.The lower；the better
D.The highest；the worst
2.單項選擇題Injectors on modern engines are cooled by a combination of the intensive bore cooling in the cylinder by a combination of the intensive bore pockets and by the fuel which is re-circulated through the injector when the follower is on the （）of the cam or when the engine is stopped.
A.slope
B.base
C.top
D.bottom
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