单选

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

试题出自试卷《轮机部三管轮考试题1(轮机英语)》

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