单选题The quantity of oil injected into the cylinder can be regulated （）.Aby turning the pump plungerBby vary the fuel valve spring forceCby no means by controlling the governorDby enlarging or diminishing the injection hole
单选题
The quantity of oil injected into the cylinder can be regulated （）.
A
by turning the pump plunger
B
by vary the fuel valve spring force
C
by no means by controlling the governor
D
by enlarging or diminishing the injection hole
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