摘要：<正>小河马大大最喜欢穿旱冰鞋,就连睡觉都不想脱下来。在光滑的路面上滑起来像飞一样,别的河马都望尘莫及呢。他跟朋友们说:"以
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Science China Mathematics Numerical Mathematics Acta Mathematica Scientia Journal of Thermal Science Applied Mathematics and Mechanics Acta Mathematicae Applicatae Sinica Chinese Annals of Mathematics,Series B Chinese Annals of Mathematics Series B Applied Mathematics:A Journal of Chinese Universities