Wristpin bearings are difficult to lubricate because of their oscillating motion and（）<br>A:their free-floating design<br>B:their relatively small size<br>C:the reciprocating motion of the piston<br>D:their position in the lubrication system

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

出自：海船船员证

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