| |||
clack-box | |||
flap valve | |||
leaf-valve | |||
flap | |||
flapper | |||
clack box; dart; dart valve; leaf valve | |||
| |||
leaf-valve | |||
| |||
leaf valve |
舌阀 : 25 phrases in 9 subjects |
Automobiles | 2 |
Aviation | 1 |
Compressors | 7 |
Electronics | 1 |
Engineering geology | 1 |
Hydroelectric power stations | 2 |
Refrigeration | 2 |
Technology | 6 |
Water resources | 3 |