Gets the total number of columns in a grid.
获取网格中的总列数。
Shanghai power grid is a typical large receiver-side network, which receives 35% of total load.
上海电网是典型的大受端电网，受电比率已达用电负荷的35%。
Shanghai power grid is a typical large receiver-side network, which receives 35% of total load.
上海电网是典型的大受端电网，受电比率已达用电负荷的35%。
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