第29题: [单项选择]最常见于儿童及少女的卵巢肿瘤是() A. 黏液性囊腺瘤 B. 内胚窦瘤 C. 颗粒细胞瘤 D. 纤维瘤 E. 卵泡膜细胞瘤 参考答案:B 答案解析:内胚窦瘤多见于儿童及青年妇女,黏液性囊腺瘤多见于30~50岁妇女,颗粒细胞瘤多见于45~55岁妇女,纤维瘤多见于中年妇女,卵泡膜细胞瘤多发生于绝经后。
第38题: [单项选择]The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of(). A. an isochronous governor B. elastic engine mounts C. a vibration damper D. a cast iron bed plate with good flexible qualities 参考答案:C