单项选择题
（）the survivors known more of how to cope with cold water in the sinking of MV Titanic in 1912 countless lives（）.
A.Have/could have been saved B.Have/could have saved C.Had/could has saved D.Had/could have been saved
单项选择题 Prior to entering a davit-launched life raft, you should make sure that（）.
单项选择题 Removing which will extinguish a fire?（）.
单项选择题 A band or collar on the top end of a boom which the topping lift, midships guy, and outboard guys are secured, is called the（）.
