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。
Our activities include production, grading, packaging and quantity and quality control at the Mining Locations, Stockpiles and Ports of Loading.
我们的业务范围包括生产，分级，包装和数量，并在挖掘地点，储存和装运港的质量控制。
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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