The application of three-down-two-up and inclined to Y type ventilation in work surface 2301, 3302, 3301 of Sihe mine has got good effects and the up corner gas is under control.
结合寺河矿2301、3302、 3301工作面应用三进两回偏Y型通风方式，取得良好效果，上隅角瓦斯始终处于受控状态。
Denim is cotton dyed indigo blue color of the warp and weft, using three-down twill weave woven right in general can be divided into light, medium and heavy categories.
牛仔布是以纯棉靛兰染色的经纱与本色的纬纱，采用三上一下的右斜纹组织交织而成，一般可分为轻型、中型和重型三类。
Denim is cotton dyed indigo blue color of the warp and weft, using three-down twill weave woven right in general can be divided into light, medium and heavy categories.
牛仔布是以纯棉靛兰染色的经纱与本色的纬纱，采用三上一下的右斜纹组织交织而成，一般可分为轻型、中型和重型三类。
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