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刚玉磨料
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刚玉磨料
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普通磨料
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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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police psychological training
police psychology
police public relation activities
police public relation propagation
police public relation propagation communication
police public relations
police public relations consciousness
police pursuit tactics
police-related internet public opinion
police resource scheduling
police restriction belt
police safeguards
police safety culture
police science and technology informatization
Police Scotland
police sign
police's law-abidingness
police social supervision
police specialization movement
police sports
Police Story
Police Story series
police sub-stations and police booths
police-tax department cooperation
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