核型为47,××,+21的唐氏综合征(又称21三体,原称先天愚型)儿,其双亲核型正常 发布时间:2017-05-19 10:23 │ 来源:www.tikuol.com 题型:单项选择题 问题: 核型为47,××,+21的唐氏综合征(又称21三体,原称先天愚型)儿,其双亲核型正常,则发病原因是:A.常染色体显性遗传B.多基因病C.新发生的畸变D.常染色体隐性遗传E.X连锁隐性遗传
题型:单项选择题 32岁,G3P1,孕40周,人工流产2次,产程进展顺利,胎儿娩出后已达30分钟,胎盘未娩出,亦无剥离迹象, * * 无出血,最可能的原因是()A.胎盘剥离不全B.胎盘剥离后滞留C.胎盘嵌顿D.胎盘完全粘连E.胎盘部分性植入 查看答案
题型:单项选择题 根据句意及首字母补全在本课中出现的单词。1. M_____ Christmas and Happy New Year!2. Fish can't live w_____ water.3. Let's d_____ our classroom before they come here.4. Oh C_____ day,families open the presents they have give each other.5. B_____ the way, how old are you?6. There is a bird at the t_____ of the tree. 查看答案
题型:单项选择题 (1)同事议论纷纷 (2)贾明接受调查 (3)贾明被派出差 (4)发生盗窃案 (5)盗窃案被侦破( )A.4-2-1-5-3B.4-1-3-5-2C.1-3-4-2-5D.3-4-5-2-1 查看答案