Research Article
Study on Change Rules of Factors Affecting Gas Loss during Coalbed Air Reverse Circulation Sampling
Figure 9
The cumulative distribution before and after the tests. (a) 1 # coal sample. (b) 2 # coal sample. (c) 3 # coal sample. (d) 4 # coal sample.
(a) |
(b) |
(c) |
(d) |