单项选择题
Shipping society approved buoyant work vests are considered to be items of safety equipment and may be worn by members of the crew（）.
A.in lieu of life preservers during fire drills B.in lieu of life preservers during boat drills C.in lieu of life preservers during an actual emergency D.when carrying out duties near a weather deck's edge
单项选择题 Removing which will extinguish a fire?（）.
单项选择题 Regular foam can be used on all but which flammable liquid?（）
单项选择题 Recharging a previously used cartridge-operated dry-chemical extinguisher is accomplished by（）.
