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Нүүрсний тэргүүн хий – нүүрс-зүсэх машины үйлдлээр олборлож буй судлын нүүр хэсгээс дэгдэж буй хий . xii Нүүрсэн Давхаргын Метан (НДМ) – Ерөнхийдөө 80%-иас 95% метанаас бүрдэх, этан, профан, азот, нүүрсхүчлийн давхар ислийн агууламж багатай байгаль дахь байдлаараа нүүрсний судалд тохиолдох метанаар-баялаг хийн ерөнхий нэршил.
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