要么象更改帐户状态的副作用那样，程序应该自动备份；要么程序必须维护一个审计跟踪以便撤销更改。
Either the program should back up automatically as a side effect of changing the state of an account, or the program must maintain an audit trail that lets you undo the changes.
该方法对超声波电源实现自动识别、跟踪以及动态匹配压电换能器谐振频率等具有非常重要的参考作用。
The method is significant to automatic identifying and tracking ultrasonic power supply, and dynamic matching piezoelectric transducer resonant frequency.
应用推荐