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Useful info

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中华人民共和国国家标准

zhong1 hua2 ren2 min2 gong4 he2 guo2 guo2 jia1 biao1 zhun3

10 3 years ago 24 minutes ago

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Guobiao Standard/China National Standard/GB/国家标准/国标

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8 years ago 3 years ago