平面任意力系，向平面任意点简化，可得到一个（）作用在简化中心的.A.主矢 B.主矩

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habit    result    talk to    get over    sorry   mad

  
I’d like to tell you a story about my best friend Jane. Last week in school we had a big fight, and she didn’t 小题1: me. It all started when she asked me if she could copy my homework. I asked her why she wanted to do that, and she said that she had forgotten to do hers. I said I didn’t think it was a good idea. I said it would start a bad小题2:and she should do her own work. She got really 小题3: at me and said she didn’t want to be my best friend anymore. I said that was OK and that I was sure she would 小题4: it. And she did. Yesterday she told me she was 小题5:. She said it was much better if she did her own work.