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单项选择题

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

相关考题

单项选择题 A large metallic device,mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached),designed to prevent the passage of a rapidly moving flame through the piping is called a().

单项选择题 A large basin cut into the shore,closed off by a caisson,and used for dry docking of ships is known as a().

单项选择题 A jack-up drilling unit elevated on the Outer Continental Shelf must have a fog horn that will sound().

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