Many South Koreans fear that aging underground tunnels could give North Korea's military a secret path south.
许多韩国人担心年代久远的数条地下通道可能会为朝鲜军队提供一条通向韩国的秘密捷径。
three methods which are the alternate path method, the direct simulation method and the improved direct simulation method are used to analyze the progressive collapse process of the underground structure subjected to its internal blast loading.
使用替代传力路径法、直接模拟法和改进的直接模拟法对地下结构在内部爆炸荷载作用下的连续倒塌过程进行分析,并将所得结果进行了对比。
This paper also carefully introduces a way and path to keep economic operation for chief draining pump in coal mine underground.
详细地阐述了保持煤矿井下大泵经济运行的途径和方法。
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