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儿童口罩
日常环境中,儿童人群用于阻隔飞沫、花粉、柳絮、微生物等颗粒物传播,阻隔鼻腔或口腔呼出或喷出污染物所佩戴的民用卫生口罩。
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soil buffering capacity
soil buffering substances
soil bulk density
soil calcium
soil capillary water
soil carbon cycling
soil carbon pool
soil carbon sequestration potential
soil carbon sink
soil cartography
soil cation exchange capacity
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soil chelation-induced phytoremediation
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soil classes of China (soil taxonomy of China)
soil classification
soil classification system
soil clay
soil cohesion
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