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| 球形单向阀; 球形截流阀 | |||
| 球形逆止阀; 球阀; 止回球阀; 球形逆止阀 | |||
| ball check: 47 phrases in 12 subjects |
| Architecture | 1 |
| Automobiles | 5 |
| Aviation | 1 |
| Chemistry | 1 |
| Drilling | 4 |
| Ecology | 1 |
| Engineering geology | 1 |
| Ice hockey | 2 |
| Oil / petroleum | 5 |
| Oil processing plants | 1 |
| Plastics | 3 |
| Technology | 22 |
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