一个函数在其定义域上若具有介值性，则其间断点的类型只能是第二类的；
When function has the quality of intermediate value in the defined area, the type of breaking point must be the second kind.
一个函数在其定义域上若具有介值性，则其间断点的类型只能是第二类的；
When function has the quality of intermediate value in the defined area, the type of breaking point must be the second kind.
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