单选题An advantage of the Christmas Tree towing method is to（）.Aincrease the towing hawser's catenary and provide more springBreduce catenary，allow operation in shallower water，and to release one barge without breaking up the entire towCenable one tug and its crew without any outside assistance to make up or break down the towDprovide rapid delivery of logs from the northwestern United States to Hawaiian sawmills
单选题
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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