The flame arrester fire resistance reservoir structure have gravel type, type or corrugated metal screen type.
阻火器的阻火层结构有砾石型、金属丝网型或波纹型。
However, the screen out fracturing mechanism in unconsolidated sandstone reservoir is complicated, and to date, less is known about its intrinsic regularity.
然而疏松砂岩脱砂压裂机理复杂，目前对其内在规律认识还不够深入。
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