Monday, August 21, 2023
问题:BQD-80/1140(660)N按下起动按钮,接触器不吸合的原因是什么?
Monday, August 21, 2023
Thursday, March 7, 2024
问题:井下主排水泵属于()A、一级用户B、二级用户C、三级用户D、四级用户
Wednesday, July 19, 2023
Saturday, September 17, 2022
Tuesday, February 28, 2023
Saturday, September 17, 2022
Saturday, February 24, 2024
Sunday, December 3, 2023
问题:下列哪种电缆适用于向采区变电所供电()。A、纸绝缘电缆B、橡胶绝缘电缆C、塑料绝缘电缆D、ABC都可以
Saturday, September 17, 2022
问题:下列哪种电缆适用于向采区变电所供电()。A、纸绝缘电缆B、橡胶绝缘电缆C、塑料绝缘电缆D、ABC都可以
Saturday, September 17, 2022
问题:矿灯电压为()。A、交流36伏B、直流4伏C、直流6伏
Wednesday, August 23, 2023
Monday, November 27, 2023
问题:QCZ83—120(225)型真空磁力启动器具有()、()和保护功能。
Saturday, September 17, 2022
Sunday, December 3, 2023
Saturday, February 24, 2024
Saturday, February 24, 2024
问题:在煤矿采区供电系统的设计过程中,进行采区供电系统设计方案拟定时应考虑哪些事项?
Thursday, March 7, 2024
问题:矿用电气设备常采用的防爆措施有()、本质安全电路、超前切断电源和快速断电系统三种。
Tuesday, September 13, 2022
问题:对于地面380/220伏动力与照明电网,供电的变压器,其中性点禁止直接接地。
Saturday, September 17, 2022