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An advantage of the Christmas Tree towing method is to（）.
A:increase the towing hawser's catenary and provide more spring
B:reduce catenary，allow operation in shallower water，and to release one barge without breaking up the entire tow
C:enable one tug and its crew without any outside assistance to make up or break down the tow
D:provide rapid delivery of logs from the northwestern United States to Hawaiian sawmills

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出自：海船船员证

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