问题
单项选择题
What type of stern tube bearing has the least friction（）.
A.Oil-lubricated bearings
B.Lignum vitae
C.Hard rubber
D.Bronze bushings
答案
参考答案：A
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What type of stern tube bearing has the least friction（）.
A.Oil-lubricated bearings
B.Lignum vitae
C.Hard rubber
D.Bronze bushings
参考答案：A
