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【多选题】
下列关于重大操作说法正确的是（）。A.
所有的重大操作（如倒换单板、复位系统、加载软件等）均应作记录
B.
操作前仔细确认操作的可行性，在做好相应的备份、应急和安全措施
C.
必须由有资质的操作人员执行
D.
修改数据后一定的时间内（一般为一）确认设备运行正常，删除备份数据
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A.
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D.
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