侵蚀转折角
参考答案：
在某个坡度以内，冲刷量与坡度成正比，超过这个转折坡度，冲刷量反而减小。黄土丘陵区侵蚀转折角为25°-28°。
阅读短文，判断正(T)误(F)。
Hello! I'm Zhang Ming. This is my classroom. We have two doors, two boards, four windows, six lights,
many desks and chairs. The wall is pink. The floor is blue. There is an English book and a math book on the
teacher's desk. My seat is near the window. My classroom is nice and clean. I like it.
( ) 1. There are two boards in the classroom.
( ) 2. There are four lights in the classroom.
( ) 3. The wall is blue.
( ) 4. There are two books on the teacher's desk.
( ) 5. Zhang Ming's seat is near the door.
下列制定人工定额的方法中，( )属于技术测定的方法。
A) 统计分析法B) 工作日写实法C) 比较类推法D) 经验估计法
