Do you try to reuse the solid materials?
你有否尝试将固体废物废物利用?。
By comparison the density of silica aerogels - the world's lightest solid materials - is only as low as 1.0mg per cubic cm.
相比之下,世界上最轻的固体材料——硅土气凝胶的密度最小也要每立方厘米1.0毫克。
Pipeline transportation refers to the transport business of delivering gas, liquid and solid materials through pipeline facilities.
管道运输,是指通过管道设施输送气体、液体、固体物资的运输业务。
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