问题
单项选择题
Back-up wires on a towed vessel provide（）.
A.a factor of safety
B.additional strength
C.a distribution of the towing load
D.All of the above
答案
参考答案：D
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Back-up wires on a towed vessel provide（）.
A.a factor of safety
B.additional strength
C.a distribution of the towing load
D.All of the above
参考答案：D