本文考虑二级火箭在实际允许区域内的最佳质量比问题，得到解的解析表达式。
On the optimum mass ratios of two-stage rocket in the practical permissible region, we get the results analytic expression.
通过对双质量振动系统的动力学参数及其相互关系的分析，提出了最佳质量比的确定方法。
A method for determination of the optimum mass ratio was proposed on the basis of analyzing the dynamic parameters of double mass vibrating system and their relationship.
大学生的生活质量比社会一般人群好，而消极感受与一般人群相似，改善学生生活质量的最佳切人点是降低消极感受。
DiscussionThe quality of college students 'life was better than general people, but the negative feelings of the students were similar to the general people.
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