The pellet has compact surface and easy for coating.
成丸表面致密，利于包衣。 成丸粒径均匀，真球度高。
With the help of them, it can be proved that the non-simply connected compact surface with nonnegative curvature must be flat.
讨论了紧致非单连通的具非负曲率的流形的一些几何性质，并应用它们证明了具非负曲率的紧致非单连通曲面必为平坦的。
With the help of them, it can be proved that the non-simply connected compact surface with nonnegative curvature must be flat.
讨论了紧致非单连通的具非负曲率的流形的一些几何性质，并应用它们证明了具非负曲率的紧致非单连通曲面必为平坦的。
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