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angles back-to-back
tech. 角背间距; 背靠背组合的角钢; 背对背角钢组合; 背对背角钢
angles back to back
bridg.constr. 背靠背组合的角钢
construct. 角背间距
oil 背对背角钢
angle back-to-back
tech. 角背间距; 背靠背组合角钢
angles back -to-back: 7 phrases in 2 subjects
Metallurgy2
Technology5