皮皮学，免费搜题
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【单选题】
已知函数 ，方程 的实根个数为 (    )
A.
2
B.
4
C.
5
D.
6
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
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相关题目：
【单选题】早在20世纪70年代,就有人用水晶胶制作标牌,尽管它具有天然水晶的效果,但由于当时水晶胶的质量与制作工艺所限,水晶胶制作的标牌( )与( )都较差。
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