问题:单体液压支柱配Π型钢支护采面中排柱初撑力是()KN。...
Sunday, September 11, 2022
问题:采煤机工作时电动机输出的功率主要消耗在()。A、截煤B、牵引C、装煤...
Thursday, February 1, 2024
问题:爆破前先制用引药,就是将雷管装进药卷做成起爆药卷。...
Friday, October 20, 2023
Sunday, January 22, 2023
Tuesday, September 13, 2022
Thursday, December 15, 2022
问题:采区回风巷、采掘工作面回风巷风流中瓦斯浓度超过()%或CO<su...
Sunday, September 11, 2022
Thursday, February 1, 2024
问题:工作面在2m<sup>2</sup>内浮煤平均厚度不超过()㎜。...
Tuesday, September 13, 2022
问题:综采放顶煤开采一个循环结束是以()工序完成为标志。A、放煤B、移架C、移溜...
Thursday, February 1, 2024
Monday, January 29, 2024
Tuesday, September 13, 2022
Tuesday, September 13, 2022
问题:采煤工作面冒顶来不及撤退到安全地点时,遇险者应靠()贴身站立。...
Saturday, December 9, 2023
Sunday, September 11, 2022
问题:断层走向与岩层走向一致或近于一致的称为走向断层。...
Thursday, December 15, 2022
问题:《煤矿安全视程》第四十五条规定,在揭露老空时,只有()方可恢复工作。A、将人员撤至安全地点B、证明老空内无危险C、进行瓦斯抽放后...
Friday, January 26, 2024
问题:毫秒延期电雷管在煤矿井下爆破时,最后一段的延期时间不能超过()。A、130msB、150msC、200ms...
Saturday, December 2, 2023
Monday, January 29, 2024
Sunday, September 11, 2022