问题
填空题
当采高不大时，利用顶板岩层具有的塑性弯曲能力，使之缓慢下沉，从而充满采空区并控制上覆岩层活动，称为（）。
答案
参考答案：缓慢下沉法
搜题请搜索小程序“爱下问搜题”
当采高不大时，利用顶板岩层具有的塑性弯曲能力，使之缓慢下沉，从而充满采空区并控制上覆岩层活动，称为（）。
参考答案：缓慢下沉法
| 同义句改写。 |
| 1. Which is your favourite book? Which book you like ? 2. Thanks for your help. Thank you me. 3. Mr Wang doesn't work in this school any longer. Mr Wang works in this school. 4. Lucy likes Chinese. Lily likes Chinese, too. Lucy likes Chinese. Lily Chinese. 5. That girl always goes home on foot after school. That girl always after school. |