价格剧降。
The physical model tests were performed to study the influence of pipe drainage system on soil permeability, groundwater level and slope residual downslide thrust.
为了研究管网渗流系统对土体渗透性能和地下水位以及边坡剩余下滑推力的影响，进行管网渗流系统的物理模拟试验。
Mechanical model of single-support downslide and multi-support downslide as well as the problem of the tipping resulted from the downslide of the support are studied.
对大采高支架单架下滑、多架下滑力学模型，以及由于支架下滑而发生支架倾倒的问题进行了研究。
Mechanical model of single-support downslide and multi-support downslide as well as the problem of the tipping resulted from the downslide of the support are studied.
对大采高支架单架下滑、多架下滑力学模型，以及由于支架下滑而发生支架倾倒的问题进行了研究。
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