The plunger may be rotated in the barrel by a rack and （） on a sleeve which is keyed to the plunger.<br>A:pinion arrangement<br>B:push rod<br>C:handle bar<br>D:cam device

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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