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鐧惧害浜戠洏app鎼滅储璧勬簮
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参考答案
齿条可以看做是形状特殊的齿轮。大部分定传动比齿轮的齿廓形状是渐开线1、He made a profession of friendship to his classmate Mary..2、His classmate do not enjoy his company because he always backbite others。
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