题目内容
(请给出正确答案)
[主观题]
The function of the bypass valve on the self-contained breathing apparatus is to ______.A.
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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