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單項選擇題

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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單項選擇題

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

單項選擇題

It is important to note that the injection only takes place when the plunger is moving up the cam （）.

A.base circle
B.slope
C.bottom point
D.top point

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