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| башмачный обратный клапан | |||
| муфта обсадной трубы с обратным клапаном | |||
| обратный клапан | |||
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浮箍 : 8 phrases in 4 subjects |
| General | 2 |
| Oil / petroleum | 4 |
| Oil processing plants | 1 |
| Technology | 1 |
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