面封的背面称为______。A.封面 B.封二 C.封三 D.底封 发布时间:2017-06-07 21:23 │ 来源:www.tikuol.com 题型:单项选择题 问题: 面封的背面称为______。A.封面B.封二C.封三D.底封
题型:单项选择题 Mary made coffee ________ her guests were finishing their meal.[ ]A.so that B.althoughC.while D.as if 查看答案
题型:单项选择题 为了减少心脏搏动伪影对心脏大血管MRI图像的影响,一般采用心电门控技术,应用本法的TR时间决定于()A.R-R间期B.P-R间期C.R-P间期D.2R-R间期E.2P-R间期 查看答案