脐带中携带含氧红细胞和营养物质自胎盘到胎儿的血管是() A.1条脐动脉 B.2条脐静 发布时间:2017-08-30 14:12 │ 来源:www.tikuol.com 题型:单项选择题 问题: 脐带中携带含氧红细胞和营养物质自胎盘到胎儿的血管是()A.1条脐动脉B.2条脐静脉C.1条脐静脉D.1条脐动脉和1条脐静脉E.2条脐动脉
题型:单项选择题 —How do you go to school? —My home is next to the school, so I usually _________ to school. [ ]A. walk B. take a bus C. ride a bike D. take a taxi 查看答案