| |||
chemical element elements and their compounds | |||
chemical elements | |||
chemical element | |||
silicon | |||
hafnium |
化学元素: 40 phrases in 11 subjects |
Agriculture | 2 |
Animal husbandry | 6 |
Architecture | 1 |
Chemistry | 1 |
Desert science | 3 |
Drilling | 1 |
Earth sciences | 3 |
General | 2 |
Metallurgy | 7 |
Solar power | 1 |
Technology | 13 |