A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.<br>A:annular blowout preventer<br>B:annulus<br>C:accumulator<br>D:automatic choke

A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.
A:annular blowout preventer
B:annulus
C:accumulator
D:automatic choke

出自：海船船员证

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