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
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1.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
2.單項選擇題Fuels of different qualities may require advancing or retarding the injection timing, in addition to which if the injection timing is advanced when the engine is running at loads below the （）, then a saving in fuel can be achieved.
A.BHP
B.MCR
C.IHP
D.MEP
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