单项选择题
It is good practice to use long towlines for ocean tows because the（）.
A.wear on the towline is equalized B.weight of the towline increases the towing force C.dip in the towline absorbs shock loads D.danger of overriding is reduced
单项选择题 In the International Code of Signals，the code signal meaning I require immediate assistance is（）.
单项选择题 In order to pay out or slack a mooring line which is under strain，you should（）.
单项选择题 In order to maintain a safe speed at all times，any necessary alterations of speed must（）.
