【单选题】变压器一次绕组加额定电压,二次绕组带负载运行时,二次电压大小将随 ( ) 和负载功率因数大小的改变而改变。 A. 空载损耗 B. 励磁阻抗大小 C. 负载电流大小 D 不清楚
【单选题】I didn’t tell her news at once because I wanted to give her surprise.
【单选题】I did not tell her news at once because i wanted to give her surprise.
【多选题】制定的险坝应急方案应报防汛指挥机构批准,方案需预估的内容有()