属于DEM中基本地形因子的有（）
A.斜坡
B.面积
C.体积
D.面元
E.坡向
参考答案：A, B, D
— _____________________
— She's an accountant. [ ]
A. Where is she?
B. What does she do?
C. What does he do?
鸡鸭共一栏，鸡为鸭之半；八鸭展翅飞，六鸡在下蛋，再点鸡与鸭，鸭为鸡倍三，请君算一算，鸡______只，鸭______只．
