第21题: [单项选择]If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably(). A. excessive pump speed B. excessive suction head C. worn wearing rings D. gross pump misalignment 参考答案:C
第22题: [单项选择]关于宫颈原位癌的说法,不正确的是() A. 好发部位为宫颈鳞柱状上皮交界处区域内 B. 病变限于上皮层内,基底膜未穿透 C. 宫颈上皮内瘤样病变不一定是宫颈原位癌 D. CINⅢ级包括原位癌 E. 阴道镜检查多能与镜下早期浸润癌相鉴别 参考答案:E 答案解析:宫颈原位癌好发于宫颈外口的移行带区;宫颈上皮内瘤样变(CIN)是宫颈癌的癌前病变,包括宫颈不典型增生和宫颈原位癌。CIN分为Ⅰ、Ⅱ、Ⅲ级,CINⅢ级即重度不典型增生和原位癌。宫颈原位癌基底膜完整,无间