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单选题
What is NOT used as a stern tube bearing，on a large vessel? （）
A
Wooden (lignum vitae) strips
B
Hard rubber
C
Resin bonded composition
D
Bronze bushings
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A vessel on the port bow whose bearing is changing to the left and range decreasing
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单选题What type of stern tube bearing has the least friction（）.A
Oil-lubricated bearingsB
Lignum vitaeC
Hard rubberD
Bronze bushings
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