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["Chaque jour un problème,,", Chaque jour un problème,无奖,重在娱乐"]["

2019-12-01View Original

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29.装渐开线园柱齿轮时,接触斑点处于异向偏接触的不正确位置,其原因是两齿轮()。? A、轴线歪斜B、轴线不平行C、中心距太大 昨天一题答案:A 8.钢中的()是有害元素。? A、?S、PB、si、Mn???????C、P、Mn?

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