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| 91. | dual purpose chemicals |
| 双重用途的化学物质 |
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| 92. | dual oil filter |
| 双联油滤器 |
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| 93. | dual path transceiver |
| 双通道收发机 |
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| 94. | dual regular polyhedron |
| 对偶正多面体 |
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| 95. | dual path transmission |
| 双道传输 |
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| 96. | dual pumping well |
| 双层抽油井 |
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| 97. | dual polarity sectio |
| 双极性剖面 |
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| 98. | dual purpose trust |
| 双重目的信托 |
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| 99. | dual propagation characteristic |
| 双传播特性 |
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| 100. | dual Schmitt trigger |
| 双重施密特触发器 |
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