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In astern towing，a tow span，also called the tow bar or towing arch，is used to（）.
A:insure that the hawser leads directly aft as it passes over the stern of the towing vessel
B:increase the stability of the towing vessel by raising the hawser off the deck
C:reduce chafing of the towing hawser
D:prevent fouling of the hawser on deck gear located on the stern of the towing vessel

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出自：海船船员证

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