問答題《煤礦防治水規(guī)定》礦井水文地質(zhì)類型應(yīng)當(dāng)幾年每進(jìn)行重新修定?當(dāng)發(fā)生重大突水事故后,應(yīng)當(dāng)幾年內(nèi)進(jìn)行重新修定?

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