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是的 方程13两个都是未知数
那么方程13是不是把所有的网格的体心上的值联立在一起求得的?
对
第一次在这个网站上求助各位大佬,报错图片不知道怎么看不了了,不好意思![IWE)}@6(NH98E9LRH@PDEK.png