胎儿哪种血管内的血液含氧量最高:A.静脉导管 B.脐动脉 C.下腔静脉 D.肺静脉 发布时间:2018-06-28 11:16 │ 来源:www.tikuol.com 题型:单项选择题 问题: 胎儿哪种血管内的血液含氧量最高:A.静脉导管B.脐动脉C.下腔静脉D.肺静脉E.主动脉
题型:单项选择题 When we think of trees at Christmas, there is ________ that immediately springs to mind-the evergreen tree beautifully decorated.A.the oneB.thatC.itD.one 查看答案