离子交换法 : 56 phrases in 14 subjects |
Agriculture | 3 |
Animal husbandry | 2 |
Chemistry | 6 |
Earth sciences | 6 |
Ecology | 2 |
Electronics | 1 |
Engineering geology | 1 |
Geology | 2 |
Metallurgy | 4 |
Plastics | 3 |
Shipbuilding | 1 |
Steel production | 1 |
Technology | 18 |
Water resources | 6 |