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2018年中考化学真题分类汇编2我们身边的物质考点9氧气1性质和用途臭氧（无答案）.doc

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1氧气（18 襄阳）12、同素异形体是指由同种元素组成的不同单质。下列和氧气互为同素异形体的是A.臭氧 B.液氧 C.石墨 D.二氧化碳（18 自贡）5.臭氧(O 3)主要分布在距离地面 10-25km 的高空，能吸收大部分紫外线，保护地球生物。它属于A.非金属单质 B.金属单质 C.化合物 D. 混合物

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