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71. | sensor aperture opening ratio |
| 传感器开口率 |
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72. | open-ended line drive |
| 开口直线驱 |
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73. | open-gap shears |
| 开口式剪切机 |
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74. | Open your mouth, please. |
| 请张开口。 |
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75. | open-jawed spanner |
| 开口爪扳手 |
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76. | center shed jacquard |
| 中开口提花机 |
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77. | water table opening |
| 井架顶开口 |
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78. | open mouth tongs |
| 开口扁钳 |
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79. | elevator split ring |
| 升降机开口环 |
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80. | snap ring spacer |
| 开口环垫片 |
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