双路供电故障转向零位（无零位的开关不作）；
Transfer to zero positon when appears fault in double circuit power supply(no action if without zero position);
系统控制处理机和FBM组件提供双路的DC供电。
System control processor and FBM component provide dual DC supply.
系统控制处理机和FBM组件提供双路的DC供电。
System control processor and FBM component provide dual DC supply.
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