问题
单项选择题
预应力混凝土简支梁的梁长为()m以上时，应验算裸梁的稳定性。
A.5
B.15
C.20
D.25
答案
参考答案：D
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预应力混凝土简支梁的梁长为()m以上时，应验算裸梁的稳定性。
A.5
B.15
C.20
D.25
参考答案：D
Life is not easy, so I’d like to say “When anything happens, believe in yourself.” When I was 14, I was___ nervous 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 contest. My mother asked me to take part in it. What a (n)___ ideal! 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（题目）. At last I the topic “Believe in yourself”. I tried my best to all the speech and practiced it over 100 times. my mother’s great love, I did well in the contest. I could not my ears when the news came that I had won the first place. I heard the cheers(喝彩声) the teachers and students. Those who once looked down on（瞧不起）me, now all said “Congratulations” to me. My mother hugged me and cried . Since then, everything has changed for me. When I do anything, I try to tell to be sure and I will find myself. This is true not only for a person for a country.
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