In recent years, adhere to the coal, for the Department to conduct an old coal mine expansion technical innovation and steady ramp up production.
近几年来，坚持以煤为主，对本部老矿井进行扩能技改，稳定提高产能。
In recent years, adhere to the coal, for the Department to conduct an old coal mine expansion technical innovation and steady ramp up production.
近几年来，坚持以煤为主，对本部老矿井进行扩能技改，稳定提高产能。
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