Thursday, December 15, 2022
荧光灯电路是根据()原理制成。A、自感B、互感C、都不是...
Friday, October 20, 2023
Sunday, September 11, 2022
内喷雾靠近截齿,有利于将煤尘削除在产生的过程中,并能抑制煤尘的扩散,因而除尘效果较好。...
Tuesday, January 23, 2024
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
Wednesday, February 8, 2023
Sunday, September 11, 2022
Thursday, February 1, 2024
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
Tuesday, January 23, 2024
Thursday, December 15, 2022
炮采工作面炮眼的联线方式是()。A、串联B、并联C、混联...
Saturday, December 2, 2023
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
Friday, December 15, 2023
Sunday, September 11, 2022
Tuesday, September 13, 2022
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
掘进巷道贯通前,综合机械化掘进巷道在相距50m前、其他巷道在相距()前,必须停止一个工作面作业。...
Sunday, January 22, 2023
《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
Thursday, December 15, 2022