The shear rams of a ship blowout preventer stack are used in emergency well control to（）.<br>A:close and seal around the drill pipe<br>B:close and seal around casing<br>C:cut off pipe inside the preventer stack<br>D:close and seal around drill collars

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

出自：海船船员证

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