问题
单项选择题
In nautical terminology a dog is a（）.
A.crow bar
B.device to force a water tigh door against the frame
C.heavy steel beam
D.wedge
答案
参考答案：B
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In nautical terminology a dog is a（）.
A.crow bar
B.device to force a water tigh door against the frame
C.heavy steel beam
D.wedge
参考答案：B