單項(xiàng)選擇題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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2.單項(xiàng)選擇題The exhaust pipe must be gas tight throughout its entire length otherwise（）.

A.bilge water may enter the exhaust pipe
B.entry of air may cause vapor lock
C.carbon monoxide may enter the interior of the vessel
D.the joint gaskets may be blown

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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
D.the face piece of the breathing device is too tight