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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1.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
2.單項(xiàng)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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