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| 71. | water filter |
| 滤水器 |
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| 72. | overflow filter |
| 溢流滤池; 溢流滤器 |
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| 73. | orthogonal filter |
| 正交滤波器 |
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| 74. | thump filter |
| 电报干扰滤除器 |
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| 75. | quadrature filter |
| 求积滤波器 |
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| 76. | multiplex filter |
| 多路复用滤波器 |
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| 77. | precipitative filter |
| 沉淀式过滤器 |
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| 78. | Recursive filter |
| 递归滤波器 |
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| 79. | multiple filter |
| 复式过滤器 |
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| 80. | filter pipe |
| 滤毒烟斗 |
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