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一旦PRIMARY应急关断控制单元出现故障，SECONDARY应急关断控制单元将自动切换为（），故障应急关断控制单元将自动切换为故障安全状态，同时发出故障报警信号等待维修
- A、离线备用
- B、关停
- C、在线控制
- D、在线热备
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更多 “一旦PRIMARY应急关断控制单元出现故障，SECONDARY应急关断控制单元将自动切换为（），故障应急关断控制单元将自动切换为故障安全状态，同时发出故障报警信号等待维修A、离线备用B、关停C、在线控制D、在线热备” 相关考题
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