Because of limitation of natural condition, the ash yard is selected in a mine out area after analysing and comparing in aspects of economy.
由于自然条件的限制，经多种方案的经济比较，灰场选择在煤矿采空区。
Because of limitation of natural condition, the ash yard is selected in a mine out area after analysing and comparing in aspects of economy.
由于自然条件的限制，经多种方案的经济比较，灰场选择在煤矿采空区。
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