依据浅埋煤层矿压显现特征，给出浅埋煤层长壁开采工作面支架合理工作阻力及安全界限的确定方法。
Base on the weighing feature of the shallow coal bed, the specifying method of the support working resistance and safety margin is presented in the shallow coal bed.
只有适时了解目前油田的经济产量界限，及时改变油田开采方式，才能提高油田整体经济效益。
Oilfield economic benefit can be improved only through timely comprehending of economic limit rate and changing of recovery method.
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