Thus it is necessary to obtain the data such as propagation law with the action of mining, the areas of subsidence areas, destroying degree and excess water section and so on.
为此，需要掌握塌陷地随开采活动的扩展规律、塌陷区面积、破坏程度和积水区范围等数据资料。
Thus it is necessary to obtain the data such as propagation law with the action of mining, the areas of subsidence areas, destroying degree and excess water section and so on.
为此，需要掌握塌陷地随开采活动的扩展规律、塌陷区面积、破坏程度和积水区范围等数据资料。
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