单选题Before doing any work on a hydraulic system equipped with accumulators, you should（）Adrain the accumulators and purge with oxygenBbleed off all stored energy from the accumulators completelyCcharge the accumulators to prevent system energy lossDpump the hydraulic fluid into the accumulators to prevent fluid loss
单选题
Before doing any work on a hydraulic system equipped with accumulators, you should（）
A
drain the accumulators and purge with oxygen
B
bleed off all stored energy from the accumulators completely
C
charge the accumulators to prevent system energy loss
D
pump the hydraulic fluid into the accumulators to prevent fluid loss
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