本文给出了几类常见函数间断点及一般实函数第一类间断点的某些特性，并指出它们在实际问题中的应用。

This paper gives some properties of several special function discontinuity point and the first kind discontinuity point of ordinary real function. and points out their ap-plicaion in actual problems.

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最后，讨论了使用这些函数时的常见问题和性能考虑。

Finally, it discussed the common problems and the performance considerations while using these functions.

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您可以在 PHP 文件中使用这些函数显示所需的常见 HTML 标记。

You can use these functions in the PHP file to help with the display of necessary regular HTML tags.

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