单选题The plunger may be rotated in the barrel by a rack and （） on a sleeve which is keyed to the plunger.Apinion arrangementBpush rodChandle barDcam device
单选题
The plunger may be rotated in the barrel by a rack and （） on a sleeve which is keyed to the plunger.
A
pinion arrangement
B
push rod
C
handle bar
D
cam device
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