单选题The shear rams of a ship blowout preventer stack are used in emergency well control to（）.Aclose and seal around the drill pipeBclose and seal around casingCcut off pipe inside the preventer stackDclose and seal around drill collars
单选题
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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