单项选择题
A.Each lifeboat must have a launching appliance
B.Launching appliances must be of the gravity type
C.There may not be more than two launching appliances on the same deck
D.All of the above
单项选择题 What could be a result of insufficient lubrication of lifeboat winches and davits?（）
单项选择题 Upon hearing the abandon ship signal，you put on your life jacket and report to your station. After the cover is removed you board your open lifeboat boat. The FIRST thing to do is to（）.
单项选择题 To keep injured survivors warm in the water after abandoning a ship，they should（）.