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开采造成的塌陷区,1984年40个煤矿矿区达135万多亩,这是矿山测量工作者造地复田的重要任务,必须尽快解决。
As a result of the subsidence area caused by mining, in 1984, there were 1.35 million mu of coal mines in 40 coal mines. This is an important task for mine surveyors to make land for restoration and must be solved as soon as possible.