单项选择题有关卵巢良性肿瘤的特点,错误的是( ) A. 多为单侧 B. 表面光滑 C. 常有腹腔积液 D. 囊性,活动良好 E. 病程长,逐渐增大
不定项选择The three-part structure refers to: the introduction, the body and the conclusion.
