问题
判断题
在EXCEL2000中可以对时间或日期进行计算。
答案
参考答案：对
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在EXCEL2000中可以对时间或日期进行计算。
参考答案：对
I was a student of yours in Grade Six, and I hope you still remember me. I’m __ this letter because I want to let you know that the school year with you was important and special to me. I know I __ be very quiet in your class, and you never said much to me. But you did something that made a big _____ in my life. You see, all through my first year in schools, I hated to read. Books were just words that had ____ to do with me, and I felt bored while reading them. I’ll never ____ the first day of Grade Six when you took out a thick book and began to read the story to our class. It ____ that your voice changed with the people in the story, and you drew pictures in my mind as you read ____ . Since that day, I always waited for the time that you read to the class. You ___ us all kinds of wonderful stories. During the summer after my year in your class, I ____ the stories you read. So one day I picked up a book and read it all by myself. I found out that I could make the words ____ , too. Now, I love to read! Thank you for opening the world of books for me. Yours, Linda
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，R2=15 
．当S1、S2都闭合时，电流表示数为1A，当开关S1、S2都断开时，电流表示数为0.2A；求电源电压U和R3阻值．