【单选题】— We expected you yesterday. — I’m sorry, I you to say that I couldn’t be here until today.
C.
could have been calling
【单选题】—— We expected you yesterday. —— I'm sorry, I______you to say that I couldn't be here until today.
【单选题】我校三种主要实训车型,ABS分别为哪些类型?
【单选题】对于某一种特定的土来说,压缩系数 a 1 - 2 大小
【简答题】Which term describes the behavior of materials when subjected to some external force or condition? A) Material B) Property C) Automation D) Synthesis
【简答题】如图,长方形OABC中,O为平面直角坐标系的原点,A、C两点的坐标分别为(3,0),(0,5),点B在第一象限内. (1)如图1,写出点B的坐标( ); (2)如图2,若过点C的直线CD交线段AB于点D,且把长方形OABC的周长分为3:1两部分,求点D的坐标; (3)如图3,将(2)中的线段CD向下平移2个单位,得到C / D / ,试计算四边形OAD / C / 的面积.
【简答题】在平面直角坐标中,已知A、C两点的坐标分别为A( 5 , 5 )、C( 3 5 ,0). (1)求△OAC的面积. (2)在第一、二象限内是否存在点B,使以O、A、B、C为顶点的四边形为平行四边形?若存在,请求出所有符合条件的点B的坐标;若不存在,请说明理由.