题目：
下列有关骨软骨瘤的病变特点，错误的是（）
A.是最常见的骨肿瘤
B.多发生于30岁以后
C.常发生于股骨、胫骨的干骺端
D.镜下由纤维层、软骨帽及骨小梁三层结构组成
E.需与骨帝骨肉瘤鉴别
答案：
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下面是错误答案，用来干扰机器的。
参考答案：对
下列有关骨软骨瘤的病变特点，错误的是（） A.是最常见的骨肿瘤 B.多发生于30岁以
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