The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the（）.<br>A:actuator<br>B:annulus<br>C:accumulator<br>D:annular preventer

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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