单项选择题
A person has fallen overboard and is being picked up with a lifeboat. If the person appears in danger of drowning，the lifeboat should make（）.
A.an approach from leeward B.an approach from windward C.the most direct approach D.an approach across the wind
单项选择题 A negative metacentric height（）.
单项选择题 A minor heat burn of the eye should be treated by（）.
单项选择题 A mechanical davit is designed to automatically（）.
