A movement along a demand curve (需求曲线）is a result of a price change alone. This is know as a change in the quantity demanded. 然后点击source files下面的add.，选中你写好的udf文件，再点击build进行编译，编译没有错误后，再点击load，一般会成功。 如果还是出错，可能是其他原因。 1 vs和fluent环境木有配置.
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