圆 头 螺钉 : 60 phrases in 15 subjects |
Agriculture | 3 |
Architecture | 3 |
Automobiles | 11 |
Aviation | 1 |
Compressors | 2 |
Construction | 1 |
Electric machinery | 1 |
Electronics | 1 |
General | 1 |
Mechanics | 2 |
Metallurgy | 2 |
Oil / petroleum | 1 |
Shipbuilding | 1 |
Technology | 29 |
Wind Energy | 1 |