题目：
The catenary（）.
A.acts as a reserve length of towing hawser when the tug applies more power，and it dampens the surge effect of the tow
B.gives an approximation of the amount of strain on the towing hawser
C.is the dip in the towing hawser between the tug and the tow
D.All of the above
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D
