关于闭区间上的连续函数,如下说法正确的是()【上册第44讲】
A. 闭区间上的连续函数一定可积
B. 闭区间上的连续函数一定单调
C. 闭区间上的连续函数一定可以使用零点定理
D. 可以使用拉格朗日中值定理
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