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【单选题】
等速干燥阶段中，在给定的干燥空气条件下，对于干燥速率的正确判断是：（）A.
干燥速率随物料种类、质量不同而有差异
B.
干燥速率随物料质量不同而有变化，而与种类不同无关
C.
对不同质量、种类的物料，干燥速率实质上相同
D.
以上都不对
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