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混凝土施工 hùnníngtǔ shīgōng
hydroel.st. concrete construction
混凝土施工 hùnníngtǔ shīgōng
construct. Concrete Construction
混凝土施工: 54 phrases in 6 subjects
Architecture1
Bridge construction3
Hydroelectric power stations6
Metallurgy1
Rail transport1
Technology42