单项选择题
The purpose of storm oil in a sea anchor is to（）.
A.weigh down the anchor B.lubricate the anchor C.repel dangerous fish D.smooth the sea
单项选择题 The process of waiting a period of time before pretensioning an anchor is known as（）.
单项选择题 The most probable position of the object of a search at any given time is the（）.
单项选择题 The key to rescuing a man overboard is（）.
