Output linewidth and energy in single pulse of laser is computed by using parameter of tunable elements and cavity construction, and the construction design is based on it.
依照调谐元件和腔结构参数来计算激光输出线宽、单脉冲输出能量，并由此来选择激光器的结构设计。
This article analyzed in brief the cause, which triggered the collapse of wall rocks during the cavity construction, the prevention measure and general principle of treatment.
本文简要分析了洞室施工中引起围岩坍方的原因，坍方的预防措施及治理的一般原则。
On the modern urban construction, the cavity, gob should be positioned when constructing the foundation, and corresponding measures to avoid damage to nearby buildings should be taken.
对现代城市建设而言，在地基处理时需要了解空洞、采空区并采取相应的处理方法，并避免附近建筑物的损坏。
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