设G为局部紧群，在一致连续函数空间U（ G）上，用两种方法证明左不变平均和拓扑左不变的等价性。
On uniformly continuous function space U(G), Equivalence of invariant mean and topological invariant mean is showed by two methods.
左：机器人向左旋转90度，并保持原先所在的格网位置不变。
Left: the robot turns left 90 degrees and remains on the current grid point.
针对普通立式车床的不足之处，在保留右刀架机械结构和操作功能不变的基础上对C5225立式车床的左刀架进给系统进行了数控化改造。
According to the shortage of C5225 vertical lathe, numerical control alteration on feed system of C5225 vertical lathe was done in the base of keeping the mechanism structure and handling function.
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