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41. | AC electroluminescence |
| 交流电致发光 |
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42. | ACSP (AC Spark Plug) |
| 交流火花塞 |
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43. | first hand exchange |
| 直接交流 |
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44. | AC power system |
| 交流电力系统 |
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45. | alternating current (a.c.) |
| 交流电流 |
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46. | AC electric machine |
| 交流电机 |
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47. | Cross-cultural communication |
| 跨文化交流 |
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48. | AC point machine |
| 交流电动转辙机 |
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49. | ac distribution |
| 交流配电 |
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50. | AC voltage stabilizer |
| 交流稳压器 |
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