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题目内容
（乐山师范学院专业英语 A卷）
The behavior of fluids is important to process engineering generally and constitutes one of the foundations for the study of unit operation. An understanding of fluids is essential, not only for accurately treating problems in the movement of fluids through pipes, pumps, and all kinds of process equipments but also for the study of heat flow and many separations that depend on diffusion and mass transfer.
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