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da guan yuan
Author(s): 
Pages: 35
Year: Issue:  11
Journal: Required Reading for Junior Middle School Students

Abstract: <正>坚硬如钢的纳米纸美国研制了一种用纤维制造的纳米纸,它具有非凡的强度,其张力几乎能与钢材相比。动物也患忧郁症研究表明,
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