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【Daily Question】Chemical Analysis Version, May 5, 2019

2019-05-05View Original

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This post was last edited by zjp on 2019-5-5 07:39. Multiple-choice question: In the codes and numbers of industry standards, GB/T in GB/T 18883-2002 refers to (). A. Mandatory **standards** B. Recommended **standards** C. Recommended standards issued by the Ministry of Chemical Industry D. Mandatory standards issued by the Ministry of Chemical Industry B

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