MOOC Mining Science(China University of Mining and Technology)1458271165 最新慕课完整章节测试答案
Chapter 10 Layout and parameter analysis of preparation roadway
Unit quiz
1、单选题:
In the joint layout of mining district, the rise (dip) is generally placed in the lower stable coal seam or floor rock stratum. What is the main reason? ( )a. It can adapt to the downward mining sequence of coal seam; b. Improve the recovery rate and reduce the coal loss; c. The production system in the district is reliable and easy to maintain; d. It is easy to access the water rich layer.
选项:
A: abc
B: acd
C: abd
D: abcd
答案: 【 abc】点我阅读全文