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低接触面 |
lower surface : 33 phrases in 13 subjects |
Agriculture | 1 |
Automobiles | 1 |
Aviation | 2 |
Bridge construction | 1 |
Chemistry | 2 |
Electronics | 1 |
Engineering geology | 1 |
Geology | 1 |
Metallurgy | 2 |
Oil / petroleum | 3 |
Polymers | 1 |
Space | 2 |
Technology | 15 |