before and after test

To achieve signal efficiency,educators should make the best of such opportunities as before and after exams,award and punishment,and accidents.

抓住考试前后、奖惩前后、变故前后等中学生心理健康教育的契机,就能收到事半功倍的效果。

Method 38 cases of preoperative and postoperative concomitant strabismus patients were made the afterimage test.

目的重新解释后像试验检测目的。

Finally,we introduce some back testing methods to validate the use of VaR model.

考虑到时变风险 ,讨论了GARCH模型 ,最后给出了评价模型的后验测试方法 。