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| 61. | directional orientation tool |
| 定向工具 |
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| 62. | etching orientation |
| 腐蚀定向 |
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| 63. | directinal mirror |
| 定向反射镜 |
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| 64. | directional vane |
| 定向叶片 |
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| 65. | directional aids |
| 定向器材 |
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| 66. | directional emissivity |
| 定向发射率 |
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| 67. | directional collector |
| 定向收集器 |
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| 68. | directional radiatio |
| 定向辐射 |
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| 69. | directional drilling |
| 定向钻孔 |
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| 70. | directive septum |
| 定向隔膜 |
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