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Advances in Civil Engineering
/
2018
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Article
/
Fig 12
/
Research Article
Acoustic Emission and Failure Modes for Coal-Rock Structure under Different Loading Rates
Figure 12
The distribution of frequency: (a) 2
#
combined sample; (b) 3
#
combined sample; (c) 5
#
combined sample.
(a)
(b)
(c)