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?（）.<br>A:The unit is working properly<br>B:The face mask is not sealed properly<br>C:The air bottle needs to be refilled<br>D:The air supply hose has a leak

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

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