然而，他们认为那些睡眠时间不超过8小时的学生在回忆旧知识、学习新课程和完成高质量工作方面面临着最大困难。
Yet they rated the students who have received eight hours or less as having the most trouble recalling old material, learning new lessons, and completing high-quality work.
他们还选择了超过1200个不活跃的星系，它们的距离和亮级都相同，这样可以保证图像的质量相同。
They then chose more than 1,200 inactive galaxies at the same distance and brightness levels to ensure all images were of the same quality.
为了保证教学质量，坚持编制不超过十五人的小班授课。
There are no more than 15 students in every class so as to guarantee the teaching quality.
对经过液相色谱分离后的化合物进行源内碰撞诱导裂解(CID)，并对化合物及其碎片离子进行精确质量测定，测定质量与理论质量之间误差不超过2。
With in-source collision induced dissociation (CID) and exact mass measurement, the differences between the calculated mass and the theoretical mass of all compounds and fragments were less than 2.
结果表明，未中和的磺化聚苯乙烯具有最明显的增容效果，其加入量不超过HIPS量的20％（ 质量分数）时共混物的冲击性能得到了提高。
The results showed that the compatibilizing effect of sulfonated polystyrene(HSPS), (with its sulfonic acid radical)was most noticeable, and an improved impact strength of more than 20% was observed.
结果表明，未中和的磺化聚苯乙烯具有最明显的增容效果，其加入量不超过HIPS量的20％（ 质量分数）时共混物的冲击性能得到了提高。
The results showed that the compatibilizing effect of sulfonated polystyrene(HSPS), (with its sulfonic acid radical)was most noticeable, and an improved impact strength of more than 20% was observed.
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