在伽例略变换下，巧妙利用零矢量，给出了任意正交曲线坐标系中质点速度和加速度的矩阵表式方法。
Under Galilean transformations, expressions of Veloeities and accelerations in vertical curve Coordinates are derived by the ingenious use of Zero Vector and means of matrix.
本文利用正交试验，将析因设计、区组设计及统计分析统一于一张正交表上。
As we all know, the statistical analysis of an incomplete block design is quite troublesome, especially for a partially balanced incomplete block design.
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