After putting on a self-contained breathing apparatus,you open the air supply and hear a continuous ringing of a bell. What does this mean? ()

A . The unit is working properly B . The face mask is not sealed properly C . The air bottle needs to be refilled D . The air supply hose has a leak

时间:2022-09-13 16:24:53 所属题库:固体散装危险品与BC规则题库

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