题目内容
若a>0,a
查看答案
搜索结果不匹配？点我反馈
更多问题
My shock and1at finding Mother in tears on Wednesday was a perfect2 of how little I understood the3on her. Sitting beside her on the couch, I began very slowly to understand.“I guess we all have to4sometime,”Mother said quietly. I could5 her pain and the6of holding back the strong emotions that were 7by my arrival. Suddenly, something inside me turned. I8 out and put my arms around her.She broke then. She put her face against my shoulder and9. I held her close and didn’t try to talk. I knew I was doing what I should, whatI could, and thatit was enough. In that moment, feeling Mother’s back10with emotion, I understood for the first time her11. She was still my mother, but she was something more: a person like me, capable of 12and hurt and 13 . I could feel her pain as shemust have felt mine on a thousand14when I had sought15 in her arms.
Z 是一个复数，不是相量。
Z 的模表示 u、i 的大小关系，辐角（阻抗角）为 u、i 的相位差。
阻抗角由电路参数决定。当 XL >XC 时， 阻抗角> 0 ，u 超前 i ，电路呈容性。
微信支付 
支付宝支付