单选题An integral part of a blowout preventer that serves as the closing element on an open hole，and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the（）.Ashear ramBblind ramCpipe ramDannular ram
单选题
An integral part of a blowout preventer that serves as the closing element on an open hole，and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the（）.
A
shear ram
B
blind ram
C
pipe ram
D
annular ram
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填空题英译中（Translate）：integral protein（）