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| 1. | printed chassis |
| 印刷电路底板 |
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| 2. | immediate bottom |
| 直接底板 |
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| 3. | A: These direct mails『（商店、非盈利机构等为招揽生意、募捐或征求会员等向人们投寄的）直接邮件』 are a waste of paper. |
| （这些直接邮件纯粹是浪费纸张。 |
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| 4. | hogbacked floor |
| 波浪形底板 |
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| 5. | infrabasal plate |
| 内底板|下底板 |
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| 6. | drawer-bottom board |
| 抽屉底板 |
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| 7. | interconnection board |
| 底板 |
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| 8. | printed circuit backplane |
| 印制电路底板 |
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| 9. | Bottom Board |
| 浇注底板 |
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| 10. | boiler bottom plate |
| 锅炉底板 |
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