pebble gravel
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Stone gravel desert was particularly prevalent in the desert between Jammu and mainly distributed in the Libyan Desert Rock, the Atlas mountains, the Piedmont Xishan, and other alluvial fan areas, such as tibbesiti gravel desert, Carrancho gravel desert, covered map Cypriot gravel desert, and so on.
砾漠多见于石漠与沙漠之间,主要分布在利比亚沙漠的石质地区、阿特拉斯山、库西山等山前冲积扇地带,如提贝斯提砾漠、卡兰舒砾漠、盖图塞砾漠等。
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Thirdly, on the basis of the productivity model of ideal wells , we comprehensively consider the additional pressure caused by different completion methods and establish four structures of multilateral horizontal wells in 8 different completion methods of the actual open hole completion, slotted liner completion,slotted liner completion with external casing packer, open hole downhole gravel pack completion, openhole prepacked gravel liner completion, casing perforated completion, inside casing gravel pack completion, inside casing prepacked gravel liner completion.
在理想井产能模型的基础上,综合考虑不同完井方式所造成的附加压力损失,建立了这四种分支水平井结构在实际裸眼完井、割缝衬管完井、带ECP的割缝衬管完井、裸眼井下砾石充填完井、裸眼预充填砾石筛管完井、射孔完井、套管内井下砾石充填完井、套管内预充填砾石筛管完井等8种不同完井方式下的产能模型。
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Different fillers for wetlands are chosen by comparison and then matched, the following filler matching is achieved aiming at different influent: for wastewater with low nitrogen concentration and medium or high organic matter concentration, better removal efficiency is attained by combined fillers of coal cinder + pebble stone + gravel; for wastewater with high nitrogen concentration and low organic matter concentration, the optimum combination is fly ash brick crumbs + gravel.
针对不同的进水进行了湿地填料的比选与配伍,获得了适合于不同水质的填料配伍:对于含氮浓度低或中、高有机物浓度的污水,煤渣+砾石+碎石填料组合有较好的去除效果;对于含氮浓度高或有机物浓度低的污水,粉煤灰砖屑+碎石组合有较好的去除效果。
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pebble gravel:小砾石
小砾;小粒 granule | 小砾石 pebble gravel | 小瘤鱼目 Thelodonti