Wristpin bearings are difficult to lubricate because of their oscillating motion and（）
- Atheir free-floating design
- Btheir relatively small size
- Cthe reciprocating motion of the piston
- Dtheir position in the lubrication system
问题
Wristpin bearings are difficult to lub
参考解析：
分类：船舶电气与船舶安全题库
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