锚杆安装角度：顶板两角锚杆与垂直线成（），其余巷道垂直顶板；巷帮靠顶、底的角锚杆与水平线成（），其余垂直于巷帮。
参考答案：30°、10°
句型转换
1. I suppose they will have a picnic.（改为否定句）
I _________ suppose they _______ have a picnic.
2. When you are invited for 8 :00 ,you should come later. (同义句)
When you are invited for 8 :00, you ______ _______ ______come later.
3. Miss Gao asked us to clean the classroom. (改为被动语态）
We_______ _______ to clean the classroom by Miss Gao.
4. Students can't take magazines out of the reading room.（改为被动语态）
Magazines_______ _______ _______ _______of the reading room.
5. Jim was made to clean his room by his mother justnow.（改为主动语态）
Jim's mother________ Jim_______ his room just now.
在和丽达乘火车出差时，保尔为给丽达找座位，和投机商人（）打了一架，最后还把肃反委员会的人请来检查车厢。
A.瓦西卡
B.莫季卡
C.布尔梅斯捷尔
D.阿基姆
