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2021-7-23 |
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2021-6-01 |
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2021-6-15 |
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2021-2-23 |
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2021-4-20 |
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2020-12-11 |
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2020-12-08 |
2021-4-23 |
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2021-4-23 |
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2021-9-03 |
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2020-12-03 |
2021-2-12 |
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2021-4-23 |
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2021-4-23 |
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2020-11-30 |
2021-4-09 |
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2020-11-30 |
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2020-11-27 |
2021-7-06 |
2021-7-06 |
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2021-3-30 |
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2021-3-05 |
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2020-11-26 |
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2021-2-11 |
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2020-11-24 |
2021-3-09 |
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2020-11-24 |
2021-2-19 |
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2020-11-20 |
2021-4-23 |
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2020-11-20 |
2021-4-23 |
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2020-11-20 |
2021-4-23 |
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2020-11-17 |
2021-4-27 |
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2020-11-17 |
2021-4-20 |
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2020-11-14 |
2021-3-19 |
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2020-11-12 |
2021-4-23 |
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2020-11-12 |
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2021-7-06 |
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2020-11-10 |
2021-1-15 |
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2020-11-09 |
2021-2-09 |
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2020-11-06 |
2021-3-19 |
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2020-11-06 |
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2020-11-05 |
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| Simple plunger, plunger gas lifting device with same and application thereof |
2020-11-05 |
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2020-11-05 |
2021-3-09 |
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2020-11-04 |
2021-1-12 |
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2020-11-03 |
2021-2-09 |
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2020-11-02 |
2021-2-12 |
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2020-11-02 |
2021-1-29 |
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2020-11-02 |
2021-2-05 |
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2020-11-02 |
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2020-10-31 |
2021-1-12 |
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2020-10-30 |
2021-1-19 |
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2020-10-30 |
2021-1-12 |
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2020-10-29 |
2021-5-27 |
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2020-10-26 |
2021-1-19 |
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2020-10-23 |
2021-1-29 |
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| Bridge type concentric constant-current water injection system and control … |
2020-10-23 |
2021-1-15 |
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| Centrifugal pump filter belt cleaning device |
2020-10-20 |
2021-1-29 |
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| Stratum drillability evaluation method based on grey prediction |
2020-10-20 |
2021-1-22 |
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| Modified nanocrystalline cellulose and preparation method thereof |
2020-10-19 |
2021-4-29 |
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| Selective hydrogenation method for alkyne in c2 fraction |
2020-10-19 |
2021-4-22 |
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