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單項(xiàng)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(xiàng)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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2.單項(xiàng)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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3.單項(xiàng)選擇題The plunger is machined to very fine tolerances, as is the matched（）in which it reciprocates.

A.barrel
B.ram
C.piston
D.rod

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4.單項(xiàng)選擇題It should be evident that the amount of fuel injected into the cylinder is dependent on the position of the helix relative to the （）.

A.inlet port
B.exhaust port
C.spill port
D.scavenge port

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5.單項(xiàng)選擇題As the plunger moves upwards in the barrel, injection will commence once the plunger has （） the spill ports and the pressure builds up.

A.opened up
B.closed off
C.lined up
D.taken off

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