单项选择题
In bad weather，what length of chain should be used with a single anchor? （）
A.3 times the depth of water B.6 times the depth of water C.10 times the depth of water D.15 times the depth of water
单项选择题 In a storm，the leeward lines of a ship’s mooring system will（）.
单项选择题 If you are caught in the left semicircle of a tropical storm，in the Southern Hemisphere，you should bring the wind（）.
单项选择题 Hurricane warnings are issued（）when winds of force 12 or above are expected.
