问题
单项选择题
对光衰减器的衰减量（）
A.要求精度高
B.要求精度低
C.没有要求
D.不能为0
答案
参考答案：A
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对光衰减器的衰减量（）
A.要求精度高
B.要求精度低
C.没有要求
D.不能为0
参考答案：A
Life is not easy, so I’d like to say “When anything happens, believe in yourself.” When I was 14, I was too to talk to anyone. My classmates often me. I was sad but could do nothing. Later, happened. It changed my life. It was an English speech（演讲）contest. My mother asked me to take part in it. What a terrible idea! It meant I had to in front of all the teachers and students of my school!“Come on, boy. Believe in yourself. You are sure to . ”Then, Mother and I talked about many different topics. At last I the topic“Believe in yourself”. I tried my best to remember all the speech and it over 100 times. With my mother’s great love, I did well in the contest. I could hardly believe my when the news came that I had won the first place. I heard the from the teachers and students. Those classmates who once on me, now all said “Congratulations!”to me. My mother hugged me and cried excitedly. Since then, everything has changed for me. When I do anything, I try to tell myself to be sure and I will find myself.
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