本文详细分析了组合电路中延时错误产生的原因，并提出了三种解决方法。
This paper shows that why can delays appear and puts forward three kinds of methods to solve delay errors.
其次对学生出现的错误进行归类总结，分析错误产生的原因并提出相应的教学建议。
Secondly, we identify error categories, analyze the reasons of error categories, and then put forward corresponding instruction advices.
本文针对两种不同的模型通过对比计算方法，指出了错误产生的原因从而加以规避。
By comparing the calculation of the two different cases, the reason why the mistakes often take place and how to prevent mistakes is discussed in this paper.
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