【单选题】Prof. McDonald said, “I regret ______ that this piece of writing is not well-focused.”
【简答题】我国的大地坐标系有北京54坐标系和西安80坐标系,请从参考椭球体、大地原点、大地控制网之平面控制网和大地控制网之高程控制网四个方面进行对比分析这两个大地坐标系。
【判断题】雷达荧光屏上显示的目标回波是表示目标的真实位置所在。
【简答题】Prof. McDonald said,“I regret ______ that this piece of writing is not well-focused." (say)
【单选题】Prof. McDonald said, "I regret _________ that this piece of writing is not well-focused."