Sunday, September 11, 2022
问题:某矿边邦高度110m,台阶高度10m,最终边帮角45度,台阶坡面...
Wednesday, September 14, 2022
Wednesday, September 14, 2022
问题:某企业在半年内发生了4起生产安全事故,人员伤亡和经济损失如下。根...
Sunday, September 11, 2022
问题:从安全生产的角度,()是指可能造成人员伤害、疾病、财产损失、作业环境破坏或其他损失的根源或状态。A、危险度B、危险C、危险源...
Monday, July 17, 2023
Thursday, September 28, 2023
Friday, September 16, 2022
Sunday, February 5, 2023
问题:在矿量和品位计算前,一般需要对取样数据进行(),包括()和()的...
Wednesday, September 14, 2022
Wednesday, September 14, 2022
问题:引起尘肺病主要因素是()。A、空中的粉尘B、空气中的砷汞含量C、空气中游离二氧化硅含量...
Thursday, October 5, 2023
问题:锚杆支护参数合理选择应根据施工地点的()等条件进行设计。A、巷道断面B、瓦斯地质条件C、地质构造D、围岩状况E、顶板岩性...
Sunday, February 5, 2023
问题:当煤层间距较近时,上下两层煤层如果同采不存在压茬关系....
Friday, November 10, 2023
Monday, September 12, 2022
Wednesday, September 14, 2022
Sunday, September 11, 2022
Wednesday, September 14, 2022
Friday, September 16, 2022
Monday, September 12, 2022