【简答题】A viscous film drains uniformly down the side of a vertical rod of radius R. At some distance down the rod the film approaches a terminal or fully developed flow such that the film thickness, δ is con...
【简答题】The British royal family is about to be slimmed down. The Queen plans to reduce the number of real royals, it was recently announced. However, there seems little sign of the monarchy (君主) disappearing...