纵隔肿瘤中,见不到钙化的是() ["A.畸胎类肿瘤
","B.胸腺瘤
","C.胸骨后甲状腺肿
","D.神经源性肿瘤
E.支气管囊肿"]
妊娠合并下列哪项不是人工流产的适应证?() ["甲状腺机能亢进","因避孕失败要求终止妊娠者","心脏病心功能Ⅲ~Ⅳ级","慢性肾炎氮质血症期","活动性肺结核"]
下列不属于真菌特性的是() ["具有核质","无叶绿素","无根、茎、叶","由单细胞组成","由多细胞组成"]
关于人工流产的说法,正确的是()。 ["器械进入宫腔突然出现无底感觉,不一定是子宫穿孔","疑为子宫穿孔,立即行剖腹探查","术时未见绒毛,肯定是漏吸","术中出血过多应马上更换小号吸管","子宫穿孔与哺乳期子宫软、瘢痕子宫、子宫畸形、术者操作失误等因素有关"]
主治心肾两虚之遗精,小便频数,白如米泔的方剂是() ["肾气丸","缩泉丸","桑螵蛸散","萆薢分清饮","真武汤"]
简述企业的概念及特征?