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。
stot