A study on classification and Improving Method of Deviation of Basketball stot
对篮球投篮偏差的分类及其改进方法的研究
But using the method, the labour intensity is huge, the ventilating condition is bad, the work is unsecure, the efficiency of stot cut is low.
其中之切割天井,通常用浅孔爆破法掘进,劳动强度大,通风条件差,作业不安全,拉槽效率低。
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