如果取消选择这两个参数，就不能对数据库进行前滚恢复，因为将不再保留日志。
If both of these parameters are de-selected, roll-forward recovery becomes unavailable for the database because logs will no longer be retained.
对用于分析步进应力加速寿命试验的累积损伤模型进行时间变换，保留模型对数据拟合的灵活性的同时简化了数学计算。
The time-transformation of the cumulative exposure model used to analyze step-stress accelerated life testing simplifies the mathematical mode without sacrificing flexibility for fitting data.
并针对录入数据很容易引入错误而提出利用保留指数与柱温的关系和同系线性规律等对数据库进行查错。
A method to check mistakes in the database is developed by means of the relationship between retention index and column temperature, and so on.
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