实验在工程流体力学教学中有着非常重要的作用，但由于条件限制，传统的真实实验常存在一些弊端和局限性。
Experiment has a very important role in the teaching of engineering fluid mechanics, but because of the condition limitations, traditional real experiment often has some drawbacks and limitations.
但由于工艺条件的限制，优化工艺操作条件具有很大的局限性，大部分情况下效果并不显著。
However, process conditions, optimization of process operating conditions have significant limitations, in most cases results were not significant.
但由于不同酶制剂最佳工作条件的不一致，使复合酶精练受到极大限制。
However, the optimal scouring conditions vary with enzyme preparation, which has greatly limited the application of compound enzymes.
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