【判断题】
不间断电源（UPS）断电前应先切换至旁路供电，同时做好临时停电的应急准备。
A. 对
B. 错
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A
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对于采用氮气或其它惰性气体对可燃气体进行置换后的密闭空间，作业前应进行含氧量检测，检测的时间不得早于作业开始前15分钟，如长时间工作，工作人员应定时轮换或休息。
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