单项选择题
A.the engineers，from a panel in the engine room
B.shutting off the current to the winch
C.pushing the switch lever arm while the winch is running
D.All of the above
单项选择题 In securing a towing cable，consideration must be given to letting go in an emergency. The possible whip of towlines when released can be overcome by（）.
单项选择题 In moderate wind and current what should be the length of chain with a single anchor?（）
单项选择题 If kinking results while wire rope is being coiled clockwise，you should（）.