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放 水 管 : 48 phrases in 15 subjects |
Agriculture | 1 |
Architecture | 1 |
Aviation | 4 |
Bridge construction | 1 |
Compressors | 1 |
Ecology | 2 |
Electric machinery | 4 |
Electronics | 2 |
Engineering geology | 1 |
General | 2 |
Hydraulics | 1 |
Hydroelectric power stations | 3 |
Oil / petroleum | 1 |
Port facilities | 1 |
Technology | 23 |