The function of the bypass valve on the self-contained breathing apparatus is to（）.<br>A:control the pressure of the oxygen as it enters the body<br>B:allow the wearer to manually give himself oxygen<br>C:release excess heat which would otherwise cause the bottle to explode<br>D:allow exhaled gases to pass outside the bottle

The function of the bypass valve on the self-contained breathing apparatus is to（）.
A:control the pressure of the oxygen as it enters the body
B:allow the wearer to manually give himself oxygen
C:release excess heat which would otherwise cause the bottle to explode
D:allow exhaled gases to pass outside the bottle

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