Influence of Small Coalpit Developing on Environment And Soil And Water Conservation
小煤窑开采对环境与水土保持的影响
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The application of time weighted average concentration for the dust monitoring in coalpit;
广泛基础加权平均条款适用于所有以往发行的股票及当时进行发行的股票。
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Objective: To study the method of monitoring and calculation for the dust concentration in coalpit.
目的:探索煤矿井下煤矿粉尘浓度的监测方法与计算方法。
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Methods The animal's model of injury caused by gas explosion was made in imitating coalpit tunnel.
方法建立模拟煤矿井下瓦斯爆炸伤动物模型。
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煤矿水源地开采对延河泉泉水流量影响的预报
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偏远山区矿山开采多以小窑掘进为主,其对地表变形的影响已引起人们的重视。
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