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| 变速器锁球; 球阀单向球 | |||
| 阻流阀球; 止回阀球 | |||
| 止回球 | |||
| 止逆球阀 | |||
| check ball: 47 phrases in 12 subjects |
| Architecture | 1 |
| Automobiles | 3 |
| Aviation | 1 |
| Chemistry | 1 |
| Drilling | 3 |
| Ecology | 1 |
| Engineering geology | 1 |
| Ice hockey | 2 |
| Oil / petroleum | 5 |
| Oil processing plants | 1 |
| Plastics | 3 |
| Technology | 25 |
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