单选题The catenary（）.Aacts as a reserve length of towing hawser when the tug applies more power，and it dampens the surge effect of the towBgives an approximation of the amount of strain on the towing hawserCis the dip in the towing hawser between the tug and the towDAll of the above
单选题
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
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