By planting Legume on the thin covered gangue, especially on the loess covered coal gangue, nitrogen accumulation also increased with the improvement of the biologic characteristics.
同时在煤矸石上加薄层覆盖物种植豆科植物，对其氮素的积累提高和生物性状的改善同样具有明显的促进作用，并以黄土覆盖效果更佳。
It is shown by the analysis that the steel grid and section steel are both applicable to the tunnel in the viscous old accumulation loess of degree IV, but steel grid is more advantageous.
经综合分析认为型钢拱架及格栅拱架均能适用于IV级黏质老黄土隧道，但格栅拱架更具优越性。
It is shown by the analysis that the steel grid and section steel are both applicable to the tunnel in the viscous old accumulation loess of degree IV, but steel grid is more advantageous.
经综合分析认为型钢拱架及格栅拱架均能适用于IV级黏质老黄土隧道，但格栅拱架更具优越性。
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