问题
单项选择题
用有名单位制(欧姆制)计算短路电路的总阻抗时，( )把各电压所在元件阻抗的相对值和欧姆值，都归算到短路点所在级平均电压下的欧姆值。
A．宜
B．可以
C．必须
D．不可
答案
参考答案：C
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用有名单位制(欧姆制)计算短路电路的总阻抗时，( )把各电压所在元件阻抗的相对值和欧姆值，都归算到短路点所在级平均电压下的欧姆值。
A．宜
B．可以
C．必须
D．不可
参考答案：C
My mother only had one eye. And because of this, I never wished her to show up in my school, being afraid that my classmates would I had an ugly mother. One day during elementary school, I was terribly ill. My mother came. “Your mom only has one eye?!” asked some of my classmates. I was so . I wished my mother would just from this world. “If you make me teased(嘲笑)，why don’t you just die?” I shouted at her, taking no notice of the sad look on her face. My mother just handed me some medicine and left without saying . At that time, I felt to say what I always wanted to say, and I didn’t think I had hurt her feelings very much. That night I saw my mom in her room, so quietly, as if she was afraid that she might me. Even so, I hated her tears from one eye. I made a : I must study hard and leave my mother. Years later my dream came true. I was quite successful and lived . I never thought of going back to see my “ugly” mother one day I got a letter, which said, “My son… I’m sorry I only have one eye. When you were little, you got into a(n) and lost your eye. As a mom, I couldn’t watching you live with only one eye. I gave you mine. I was never with you and I never regretted(后悔) what I did because I you…” I cried out aloud. Only then did I realize how beautiful my mother was!
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