Bill said they would have ___________ ho 发布时间:2017-07-02 08:37 │ 来源:www.tikuol.com 题型:选择题 问题: Bill said they would have ___________ holiday.A. a eight-day B. an eight-day C. an eight-days
题型:选择题 请正确将下列各血管的名称与其相应的特点相连:A、动脉 a、管壁较薄、弹性小,血流速度慢B、静脉 b、管壁厚、弹性大,血流速度快C、毛细血管 c、管壁最薄,血流速度最慢 d、只允许红细胞单行通过. 查看答案