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
Monday, January 29, 2024
我国规定通过人体的允许安秒值是()mA﹒S。A、30B、50C、60...
Friday, January 26, 2024
用交流电压表测得交流电压是220V,则此交流电压的最大值是380V。...
Tuesday, January 23, 2024
Wednesday, October 25, 2023
为保证采煤机、刮板输送机的安全使用,《煤矿安全规程》规定,要求在采煤机上必须安装有能停止工作面刮板输送机的闭锁装置。...
Sunday, January 22, 2023
Thursday, December 15, 2022
Tuesday, January 23, 2024
刮板输送机启动时,一般应()。A、先发信号B、先断续点动C、直接正式启动...
Sunday, May 26, 2024
刮板输送机启动时,一般应()。A、先发信号B、先断续点动C、直接正式启动...
Sunday, May 26, 2024
采面煤层底板不宜过软,支柱钻底量应小于(),否则应采取加大底座或穿铁鞋柱的措施。...
Wednesday, October 25, 2023
Tuesday, September 13, 2022
采煤工作面所有安全出口与巷道连接处()范围内,必须加强支护。...
Saturday, December 9, 2023
Sunday, May 26, 2024
Wednesday, June 7, 2023
Sunday, September 11, 2022
属于开拓巷道的是()。A、井筒B、采区车场C、工作面运输平巷...
Thursday, February 1, 2024
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
掏槽眼应尽量布置在软岩层中,或在巷道断面中下部处,并比其它炮眼加深()毫米。...
Sunday, May 26, 2024
Wednesday, August 9, 2023