The problem of traditional multiple integral is insufficient of student's space graphs thought.

传统的重积分教学问题是学生空间思维的不足。

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This paper deals with the identification of nonself-balanced system with multiple integral link.

本文讨论含有多重积分环节的无自平衡系统的辨识问题。

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By several examples, we illustrated how to use the analytical method to determine the limits of integral in the problem on exchanging the order of multiple integral.

本文用例子说明在多重积分换序问题中，如何用分析方法确定积分限。

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