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alumina abrasive
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alumina abrasive
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alumina abrasive
刚玉磨料
以a型三氧化二铝为主晶相的普通磨料。简称刚玉。旧莫氏硬度8.9~9.1,新莫氏硬度12。
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non-standard cosmological model
non-standard cosmology
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nonstandard integer
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nonstandard operator theory
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Non-state Education Promotion Law of the People's Republic of China
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