当温度继续降低时，铸锭表面传热系数又迅速减小。
After that, the heat transfer coefficient is rapidly decreased with temperature decline.
在表面覆盖度比较高时，表面扩散系数有一极大值。
There is a maximum of the surface diffusivity in high surface coverage.
阐明了表面张力系数的物理意义；
The physical significance of the surface tension coefficient is expounded;
表面换热系数；
表面换热系数；
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