The paper discussed the characters of derivatives that it has the character of intermediate value property and it has no the character of the discontinuity points of the first kind.
讨论导函数的若干性质：导函数具有介值性、导函数无第一类间断点。
This paper intends to discuss the relation of the intermediate-value property and continuity of a function and point out the intermediate-value property of derivatives.
讨论了函数的介值性与连续性之间的相互关系以及导函数的介值性。
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