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Group Standards of the People's Republic of China, ?? ???

Professional Standard - Machinery, ?? ???

Hubei Provincial Standard of the People's Republic of China, ?? ???

Fujian Provincial Standard of the People's Republic of China, ?? ???

VN-TCVN, ?? ???

American Society for Testing and Materials (ASTM), ?? ???

Taiwan Provincial Standard of the People's Republic of China, ?? ???

Heilongjiang Provincial Standard of the People's Republic of China, ?? ???

Shandong Provincial Standard of the People's Republic of China, ?? ???

PL-PKN, ?? ???





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