问题:为什么要测量电气设备的绝缘电阻?测量结果与哪些因素有关?...
Sunday, October 9, 2022
Friday, September 16, 2022
Wednesday, March 27, 2024
Friday, September 16, 2022
Friday, September 16, 2022
问题:铣床中,铣刀的旋转是()。A、主运动B、进给运动C、辅助运动D、直线运动...
Wednesday, February 8, 2023
问题:在正弦交流电解析式i=I√2sin()中,I表示电流有效值,()...
Friday, September 16, 2022
Tuesday, September 13, 2022
问题:双向晶闸管额定电流采用()A、平均值B、有效值C、瞬时值D、峰值...
Thursday, March 30, 2023
问题:叠加原理只适用于线性电路,可以用来计算电压和电流,但不能用来计算()。...
Thursday, May 25, 2023
问题:一台电动机需要制动平稳和制动能量损耗小时,应采用电力制动的方法是...
Friday, September 16, 2022
问题:测量发电机的轴电压时,测量用的导线应用铜丝刷压在()上,接触良好。...
Saturday, July 22, 2023
Monday, October 16, 2023
Friday, September 16, 2022
Friday, September 16, 2022
Friday, September 16, 2022
问题:电压变化率是变压器的主要性能指标之一,对于电力变压器,由于一、二...
Friday, September 16, 2022
问题:用兆欧表测量绝缘电阻时,兆欧表的转速最好在()转/每分钟。...
Friday, March 17, 2023
问题:1N240、1N250电机作为膨胀机的负载,主要起()作用。...
Tuesday, October 25, 2022
问题:结合每月的反事故预演记录,叙述一下当UPS主回路电源中断时的现象...
Friday, September 16, 2022