问题
单项选择题
热铆时，如果用普通碳素钢铆钉，使用铆钉枪时，应把铆钉加热到（）。
A、低于800℃
B、800℃左右
C、1000℃左右
D、不低于1100℃
答案
参考答案：C
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热铆时，如果用普通碳素钢铆钉，使用铆钉枪时，应把铆钉加热到（）。
A、低于800℃
B、800℃左右
C、1000℃左右
D、不低于1100℃
参考答案：C
One day, my English teacher asked me to help her save back-up（备份） copies of her work in the computer. I then realized I was able to know the grades of all of her students. I 1 her how to copy files（文件） from one disk to another and she thanked me. A few days later, she asked me to help her again, because she 2 how to do it. When I showed it to her, some students in my class 3 and began to talk among themselves 4 .Later that day, at lunch time, several of them came up to me. “Hey, could you help us change our grades? We’ll 5 for it.” I could not believe what I heard. I could get paid for something very 6 . “All right. I’ll do it.” The next day, my English teacher 7 me to help him out again. When he was not paying 8 , I changed their grades from Fs to As. I soon became very 9 among my friends. They began to treat me like God who could do 10 . Word spread quickly and I became very rich. Everything was going fine 11 I was called into the headmaster’s office. When I got there, both of my teacher and the headmaster were very angry. “ I don’t want to 12 what your teacher said, but I have to. She has too much evidence(证据),’’ the headmaster said. “Do you have anything to say for yourself?” “No,” I said finally. I didn’t realize how 13 my behavior had been. I had disappointed my teacher and the headmaster. And there was no way 14 . I had to leave my school. That was a good 15 for me.
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