Before doing any work on a hydraulic system equipped with accumulators, you should（）<br>A:drain the accumulators and purge with oxygen<br>B:bleed off all stored energy from the accumulators completely<br>C:charge the accumulators to prevent system energy loss<br>D:pump the hydraulic fluid into the accumulators to prevent fluid loss

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

出自：海船船员证

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