1楼:高边坡开挖专项安全措施
https://wenku.baidu.com/view/994925d4ed630b1c58eeb59e.html
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2楼:[图]赤平投影法确定稳定边坡角
http://jz.docin.com/p-1115789393.html
浅谈矿山开采设计边 ..
3楼:[图]赤平投影原理及讲解
https://wenku.baidu.com/view/f6c3e14bb9d528ea80c77952.html
http ..
4楼:[图]赤平投影图原理
https://wenku.baidu.com/view/f6c3e14bb9d528ea80c77952.html
采用赤平 ..