单项选择题
A large oil fire on the deck of a ship can be fought most effectively with（）.
A.dry chemical B.foam C.high-velocity fog D.water
单项选择题 A life line must be conncted to the life raft（）.
单项选择题 A life raft which has inflated bottom-up on the water（）.
单项选择题 A load line of a ship is assigned by the（）.
