【简答题】已知在某二级直齿锥齿轮 ——斜齿圆柱齿轮传动中, 1 轮为驱动轮, 3 轮的螺旋线方向如题 图所示。为了使 II 轴轴承上所受的轴向力抵消一部分,试确定 1 轮的转动方向。并将各轮轴向力 F a1 、 F a2 、 F a3 、 F a 4 的方向、 4 轮的螺旋线方向和 1 轮的转动方向标在图中。
【单选题】It is a wise father that knows his own child, but today a man can boost his paternal(fatherly)wisdom — or at least confirm that hes the kids dad. All he needs to do is shell out $30 for paternity test...