If undo is implemented correctly, then there's only one destructive operation in the entire system: emptying the Recycle Bin.
如果恢复功能实现正确，整个系统只会有一个破坏性的操作：清空垃圾箱。
How to ensure safety reliability is explained for safety operation of disproportionated reactor when non-destructive testing.
阐述了无损检验如何才能保证歧化反应器使用的安全可靠性。
Compared with soxhlet extraction method, the NMR method features smaller sample consumption, rapid measurement, simple operation and non-destructive to samples.
与索氏萃取法相比，核磁共振法的样品用量少，测量速度快，操作简便，不损伤样品。
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