问题
单项选择题
在断路器动、热稳定性试验中，4s热稳定电流试验在( )下进行，额定动稳定电流在63kA(峰值)下进行。
A．29kA
B．25kA
C．15kA
D．30kA
答案
参考答案：B
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在断路器动、热稳定性试验中，4s热稳定电流试验在( )下进行，额定动稳定电流在63kA(峰值)下进行。
A．29kA
B．25kA
C．15kA
D．30kA
参考答案：B
When I was19 years old, I had a part-time job in a hospital. At that time I was shy and didn’t believe in myself. I talked with others. I wasn’t confident in any future. Later I met a doctor, Mike, and we became good friends. He me to believe in myself and try to communicate with others. He helped me learn to enjoy myself. He also asked me to take some important courses. I did he told me and did very well. One day, he asked me what I my life to be like. I hadn’t thought about it before. That night, I thought it over and finally knew the life I had been . From then on, I started to work for it. Later I got a chance to go to college, but I had another friend. At that time I was too to pay for my education. I was very frustrated and didn’t know what to do. When I wanted to my dream, Mike helped me again. He to pay for my college education. He helped me asking for anything in return 作为回报. After graduating 毕业, I got my dream job and I like it very much. Mike made me enter a different . I am so lucky to have met such a good friend in my life.
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