Sunday, October 6, 2024
Wednesday, March 20, 2024
Monday, October 7, 2024
Sunday, February 16, 2025
问题:目前执行的国家防爆电气标准是GB3836-2000。...
Sunday, September 11, 2022
问题:万用表测量完毕后,将量程开关置于()位置。A、电阻挡位B、电流挡位C、最大交流电压挡位...
Friday, January 10, 2025
问题:[齐纳二极管就是()二极管。A、开关B、稳压C、整流...
Wednesday, September 6, 2023
Wednesday, September 14, 2022
问题:打开隔爆外壳检查时,必须先测瓦斯浓度。瓦斯浓度在()以下方准许打...
Sunday, September 11, 2022
Thursday, October 5, 2023
问题:电气设备必须有合格的接地装置(),综合保护器和漏电继电器要有合格...
Sunday, September 11, 2022
问题:螺栓的螺纹应露出螺母()螺距。A、1~3B、2~4C、3~6...
Friday, September 23, 2022
Sunday, September 11, 2022
问题:防爆电气设备入井前,应检查其“产品合格证”、“煤矿矿用产品安全标志”及安全性能;检查合格并签发合格证后,方可入井。...
Friday, March 7, 2025
问题:同一紧固部位的螺母。螺栓其规格应一致。螺纹裸露部分一般不得超过两...
Sunday, September 11, 2022
问题:用非金属材料外壳或非金属外壳部件制造的防爆电气,其非金属材料必须...
Wednesday, September 14, 2022
问题:移动式和手持式电气设备,都应使用专用的()电缆。...
Wednesday, September 14, 2022
问题:矿井应有两回路电源线路,两回路电源线路上都不得分接任何负荷。正常...
Wednesday, September 14, 2022
Sunday, September 11, 2022
问题:井下供电的“三无”指:无鸡爪子;无羊尾巴;无明接头。...
Sunday, February 16, 2025