单项选择题
Flame screens are used to（）.
A.contain flammable fumes B.protect firefighters from flames C.prevent flames from entering tanks D.keep flames and sparks from getting out of an engine's exhanst system
单项选择题 Flooding of any compartment in a ship that results in a serious loss of reserve buoyancy will always（）.
单项选择题 Floors aboard ship are（）.
