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炮掘煤巷一米造价
煤矿设计风巷及其下绕道炮掘作业规程
In or der to e nsur e normal tea chi ng or der, pr otecti ng stude nts ' healt hy growt h, ensuri ng that nati onal (pr operty) is not lost, to pr event or mi nimize the occurre nce of safety accide nts, foll ow the "prevent, re scue ea ch other, e nsure safety and reduce l osses" pri nci ple, a ccording t o the l ocal conditi ons, make t he manageme nt system. 1, the principal i s the responsi bi
炮掘煤巷锚网支护施工的工艺改进
介绍了防治锚网支护在煤巷中出现网兜、片帮现象 ,进行的工艺改进。