Back-up wires on a towed vessel provide（）.<br>A:a factor of safety<br>B:additional strength<br>C:a distribution of the towing load<br>D:All of the above

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

出自：海船船员证

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