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该书11.8节（中文版305页，英文版411页）中的例2，推导源项的表达式时，高阶格式减去一阶迎风格式，一阶格式的值取上上游的值φu，为什么这里不取φc呢？先谢谢了。 7a735b6e-01c9-4088-971a-359144da8189-image.png
