How do supermarkets encourage you to come back soon and may be spend more? They ________1________________, which __________2_________________ very attractive special offers.
【简答题】已知一对标准安装(无侧隙安装)的外啮合渐开线标准直齿圆柱齿轮的中心距 a =360mm,传动比 i 12 =3,两轮模数 m =10 mm ,且均为正常齿制。试求: 1 两轮齿数 z 1 =____ mm 、 z 2 =____ mm ; 2 分度圆直径 d 1 =____ mm 、 d 2 =____ mm ; 3 齿顶圆直径 d a 1 =____ mm 、 d a 2 =____ mm ; ...