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