The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the ______．A.ActuatorB.AnnulusC.AccumulatorD.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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