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| 钻屑膨润土比 | |||
| 钻屑#土比 | |||
| 钻屑一膨润土比 | |||
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| 钻屑一膨润土比 | |||
| drilled solids to bentonite solids ratio: 1 phrase in 1 subject |
| Drilling | 1 |
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