单项选择题
The shear rams of a ship blowout preventer stack are used in emergency well control to（）.
A.close and seal around the drill pipe
B.close and seal around casing
C.cut off pipe inside the preventer stack
D.close and seal around drill collars
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The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.
A.pressure differences in the atmosphere
B.the length of the hose attached to the facepiece
C.the physical exertion of the person wearing the device
D.spaces containing poisonous vapors -
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The radiotelephone urgency signal is（）.
A.mayday
B.pan pan
C.securite
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The Muster List (“Station Bill”) shows each person’s lifeboat station，duties during abandonment，basic instructions，and（）.
A.all emergency signals
B.instructions for lowering the lifeboats
C.the time each weekly drill will be held
D.work schedule
