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| 31. | A.C. impedance |
| 交流阻抗 |
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| 32. | experimental forecast |
| 经验预报;经验预报 |
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| 33. | rule of a thumb |
| 经验方法;经验方法 |
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| 34. | A.C.electrical power transmission |
| 交流输电 |
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| 35. | alternating-current torque motor |
| 交流扭矩电动机;交流陀螺修正电动机 |
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| 36. | 12月25日，北京大学第五届教职工代表大会暨第十七次工会会员代表大会第二次会议在英杰交流中心召开。 |
| On December25 th,5 th PKU Staff Representative Conference( SRC) was held at Ying Jie Communication Center. |
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| 37. | any language that pretends to communicate but actually does not. |
| 装作交流实际上没有交流的语言。 |
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| 38. | A.C. voltage |
| 交流电压 |
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| 39. | generator ,alternating current (excl. those for internal combustion engines) |
| 交流发电机（不包括内燃机用交流发电机） |
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| 40. | Exchange scholar |
| 交流学者 |
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