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问题：
[单选题]下列计算机操作不正确的是（ ）。
A、开机前查看稳压器输出电压是否正常(220V)
B、硬盘中的重要数据文件要及时备份
C、计算机加电后，可以随便搬动机器
D、关机时应先关主机，再关外部设备
参考答案：
C
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