单项选择题

The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the（）.

A.actuator
B.annulus
C.accumulator
D.annular preventer

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液化气体与IGC规则

The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the（）.