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单选题
The bearing shell generally has （） for location and oil grooves round the center of its axial length.
A
tips
B
tags
C
lips
D
keys
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单选题Signs of racking stresses generally appear at the（）.A
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单选题A vessel has been equipped with an oil lubricated stern bearing and is undergoing a routine dry-dock.Which of the following inspection should be made when the tail-shaft has been drawn?（）A
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seeD
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