棒形悬式复合绝缘子的伞套表面单个缺陷面积(如缺胶、杂质、凸起等)应不大于()。 ["20mm²","25mm²","100mm²","300mm²"]
机组稳定运行状态的含义是什么?
FQD-25∕100HYG型绝缘子的最小工程爬电距离为()。 ["1200mm","1500mm","1600mm","1900mm"]
FQX-25∕100QH型绝缘子的绝缘部分长度不小于()。 ["500mm","600mm","700mm","800mm"]
交流电动机定子绕组做交接时交流耐压标准为()。 ["A.0.5(2Un+1000)V","B.0.75(2Un+1000)V","C.(2Un+1000)V","D.1.5(2Un+1000)V"]
水轮机调节工作的实质是什么?