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21. | preliminary planning |
| 初步规划 |
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22. | preliminary reading |
| 预先读出 |
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23. | preliminary shaft |
| 锁口|井颈 |
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24. | preliminary breaker |
| 粗碎机 |
|
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25. | preliminary sour |
| 初酸洗 |
|
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26. | preliminary work |
| 前期工作 |
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27. | preliminary specifications |
| 预制的施工说明 |
|
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28. | preliminary agreement |
| 初步合约 |
|
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29. | preliminary test |
| 初步检验 |
|
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30. | preliminary cast |
| 初模型 |
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