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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1.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
2.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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