A、A.should be worn while fighting a fire
B、B.can be used in atmosphere deficient in oxygen
C、C.filter contaminants from air that is to be breathed
D、D.may be substituted for a self-contained breathing apparatus
更多“Gas masks（）.”相关的问题
A、a gas mask suitable for protection against each refrigerant used, or a self contained breathing apparatus must be provided B、it is the sole responsibility of the chief engineer to ascertain that all members of the engineering department are familiar with the use of gas masks or breathing apparatus C、spare charges shall be carried for at least 50% of each size and variety of gas masks and/or self contained breathing apparatus D、all of the above
A、canister-type gas mask B、fresh-air breathing apparatus C、self-contained breathing apparatus D、combustible gas indicator
A、portable ventilation system B、flame safety lamp C、self-contained breathing apparatus D、gas mask
A、mask1为Add方式，mask2为Subtract方式 B、mask1为Add方式，mask2为Intersect方式 C、mask1为Add方式，mask2为Difference方式 D、mask1为Add方式，mask2为Add方式
A、should be worn while fighting a fire B、can be used in atmospheres deficient in oxygen C、filter contaminants from air that is to be breathed D、may be substituted for a self-contained breathing apparatus
A、MASK／BOOM开关在BOOM位；ALT／NORM开关在NORM位 B、MASK／BOOM开关在MASK位；ALT／NORM开关在NORM位 C、MASK／BOOM开关在MASK位；ALT／NORM开关在ALT位 D、MASK／BOOM开关在BOOM位；ALT／NORM开关在ALT位
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