单项选择题
A.should be coiled in a clockwise direction
B.should be coiled in a counterclockwise direction
C.may be coiled either clockwise or counterclockwise
D.should never be coiled
单项选择题 Limit switches on gravity davits should be tested by（）.
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?（）