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lignitous
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1.
Research
of
Reasonable
Top
-
Coal
Thickness
for
Lignitous
Coal
Deposits in Dayan
Mining
Area
大雁
矿区
褐煤
层
综
放
开采
合理
顶
煤
厚度
的
研究
dà yàn
kuàng qū
hè méi
céng
zèng
fàng
kāi cǎi
hé lǐ
dǐng
méi
hòu dù
de
yán jiū
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