单项选择题
The connected joints of pipe，usually made of three joints of pipe approximately 90 feet long，racked in the derrick when making a trip are called a（）.
A.string
B.stand
C.joint
D.standpipe
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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
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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
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A.Crescent
B.Sheath-screw boom
C.Quadrantal
D.Radial
