题目内容
滚子从动件滚子半径必须小于凸轮曲线最小曲率半径。
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凸轮从动件采用余弦加速运动规律时存在刚性冲击。
凸轮从动件采用等速运动规律时存在刚性冲击。
Write down the words for the opposite sex.(写出与下列单词性别相反的词。
Complete the following dialogue.(补全对话)。A: What can I do for you?B: Yes, please.1 But what kind of flowers should I buy,roses or cartons(康乃馨)? She likes red roses best，but today is Mother's Day.A: I think carnations are special for today. They show happiness, sweetness and love. They are for mothers.B:All right. Can I have a look at those carnations?A: Sure.2B: RedA: What about these?B:Great.3A: 30 yuanB: OK.4A: Thank you. Here's the change and a card from our shop to your mom. Best wishes for her.B:5
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