Based on a review of relative domestic literature in recent 10 years, general concept of coordination degree of environment-economy compound system and its calculation method was proposed.

文章在总结近10年来国内相关研究的基础上，提出了较为综合的环境经济复合系统协调度概念及计算方法。

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Risk analysis is one of the important items of feasibility stu-dy, concept research and project review on a space system with high risk.

风险分析是大型工程，特别是具有高风险的航天系统可行性研究、案论证和方案评审等的主要内容之一。

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The empirical formulas which define the overall dimension of launching tower are provided, and the methods and procedure which are used to review the tower's system concept are introduced.

介绍了确定发射塔总体尺寸的经验计算公式以及对发射塔总体方案的评审方法和步骤。

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