问题
单项选择题
A metal object on the pier resembling a tree stump and made to receive mooring lines is a（）.
A.bight
B.bollard
C.chock
D.camel
答案
参考答案：B
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A metal object on the pier resembling a tree stump and made to receive mooring lines is a（）.
A.bight
B.bollard
C.chock
D.camel
参考答案：B