单项选择题
Which one is not the personal safety equipment?（）
A.Life jackets B.Survival at Sea manual C.lifeboat D.torch
单项选择题 Water is a very effective fire extinguishing agent because it（）
单项选择题 A large oil fire is best extinguished with（）
单项选择题 Fires in escaping flammable gas are quickly brought under control by（）
