单选题Wristpin bearings are difficult to lubricate because of their oscillating motion and（）Atheir free-floating designBtheir relatively small sizeCthe reciprocating motion of the pistonDtheir position in the lubrication system
单选题
Wristpin bearings are difficult to lubricate because of their oscillating motion and（）
A
their free-floating design
B
their relatively small size
C
the reciprocating motion of the piston
D
their position in the lubrication system
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