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优质碳素结构钢 yōuzhì tànsù jiégòugāng
auto. improved carbon structural steel; quality carbon structure steel
hydroel.st. quality carbon structural steel
met. high quality carbon structural steel
tech. carbon construction quality steel; carbon structural quality steel
wind. carbon constructional quality steel
优质碳素 结 构钢
: 3 phrases in 1 subject
Metallurgy3