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Heilongjiang province
permafrost
6
China
3
Xiao Xing’an Mountains
3
freezing/thawing index
3
methane emissions
3
southern boundary of permafrost
3
spatial–temporal distribution
3
static electricity
3
Environmental effects of industries and plants
2
Environmental sciences
2
GE1-350
2
Renewable energy sources
2
TD194-195
2
TJ807-830
2
envir
2
geo
2
atmospheric electrodischarge
1
wildfire
1
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