The effect of basic rock thickness, mining height and advancing speed on roof breaking is analyzed.
并进一步分析了基岩厚度、采高、推进速度对顶板破断的影响。
The effect of milling depth is the biggest, next is milling speed, and the minimal is advancing speed.
背吃刀量对温度影响最大,铣刀转速次之,进给速度影响最小。
It is obvious that mountaineering can enhance the physical quality, such as the power of waist and legs, the speed and endurance of advancing, the ability to balance your body.
登山可以明显提高腰、腿部的力量,行进的速度、耐力,身体的协调平衡能力等身体素质。
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