Those in the control group not only didn't see a grade increase, they had lower grades than the grading before the study began.
对照组的学生不仅成绩没有提高，而且比研究开始前的成绩还要低。
To adopt grading control methods in balancing position increases the system stiffness and stability.
对转子平衡位置采取分级控制策略提高了系统的刚度及稳定性。
With the promotion of road grading, the control of vertical deflection in bridge design is becoming more important.
随着道路等级的提高，桥梁设计中竖向挠度的控制显得尤为重要。
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