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21. | bare and line chart |
| 划线图表 |
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22. | marking knife |
| 划线刀 |
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23. | marking tool |
| 划线工具 |
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24. | streak chromatography |
| 条痕色谱(法) |
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25. | marking calliper |
| 划线卡尺 |
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26. | scribe projection |
| 划线投影 |
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27. | general crossing |
| 无记名划线 |
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28. | streak photography |
| 纹影摄影术 |
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29. | plate streaking |
| 平板划线 |
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30. | streak lightning |
| 枝状闪电 |
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