问题
单项选择题
A wooden float placed between a ship and a dock to prevent damage to both is called a（）.
A.camel
B.dolphin
C.rat guard
D.wedge
答案
参考答案：A
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A wooden float placed between a ship and a dock to prevent damage to both is called a（）.
A.camel
B.dolphin
C.rat guard
D.wedge
参考答案：A
