题目内容：
函数y＝x³＋4在区间(－1，1)内是（ ）
A．凹的 B．凸的
C．既有凹又有凸
D．直线段
参考答案：
答案解析：
单选题：函数y＝x³＋4在区间(－1，1)内是（ ）
- 题目分类：高等数学(一)微积分
- 题目类型：单选题
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B．凸的
C．既有凹又有凸
D．直线段
B．凸的
C．既有凹又有凸
D．直线段
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