永冻层之下的土壤越硬，所需要的药室装药量也越大。
The harder the material under the permafrost is, the larger the chamber charge required .
本文介绍了爆破方案，包括药室布置、爆破参数选择、药量及装药结构、起爆网路等有关技术。
In this paper, the blasting design was introduced, including the layout of charged Chambers, the selection of blasting parameters, charge weight, charging structure and priming network.
本文讨论了单室双推力星形装药固体火箭发动机的结构优化方法。
This paper presents a method of optimum design for single-chamber double-thrust solid rocket motors.
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