单项选择题
The C02 flooding system is actuated by a sequence of steps which are（）.
A.break glass，pull valve，break glass，pull cylinder control
B.sound evacuation alarm，pull handle
C.open bypass valve，break glass，pull handle
D.open stop valve，open control valve，trip alarm
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The bypass valve on a self-contained breathing device should be opened if（）.
A.you are entering a space containing poisonous vapors
B.you are entering a space containing explosive gases
C.the regulator of the breathing apparatus malfunctions
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