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| 61. | two-way quotation |
| 双向报价单 |
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| 62. | forward backward counter |
| 双向计数器 |
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| 63. | circuit worked on up and down bias |
| 双向电路 |
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| 64. | a two-way switch |
| 双向开关 |
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| 65. | double throw contact |
| 双向触点 |
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| 66. | two-way flow of message |
| 双向交流信息 |
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| 67. | double-acting spring |
| 双向弹簧 |
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| 68. | two way conversation |
| 双向交谈 |
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| 69. | two dimensional stress |
| 双向应力 |
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| 70. | two-component accelerometer |
| 双向加速度计 |
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