小地区测量工作采用的坐标系是（）。
A.极坐标系
B.平面直角坐标系
C.地心坐标系
D.空间坐标系
参考答案：B
____you had worked hard, you would have easily passed the final test.
A．When
B．If
C．Thought
D．Since
战略规划的过程
