为乘客和机组成员储存调节和输送氧气的组件和部件，包括氧气瓶，释压活门，关断活门，出口，调节器, 面罩等
A.the units and components which store, regulate and deliver oxygen to the passengers and crew include oxygen bottles, relief valve, shut-off valves, outlets, regulators, masks, etc. B.The units and. components which reserve adjust and transfer oxygen to the passengers and pilots include oxygen bottles, relief valves, shut-off valves, outlets, regulators, masks, etc. C.The units and components to store adjust and transfer oxygen to the passengers an crew include oxygen bottles, release valve shut-off valves, outlets, regulators, masks, etc.正确答案A
