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51. | alternating-current servomechanism |
| 交流伺服机构 |
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52. | mass exchange |
| 质量交流 |
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53. | generator, alternating current, hydraulic |
| 交流水轮发电机 |
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54. | ACSP (AC Spark Plug) |
| 交流火花塞 |
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55. | alternating current ammeter |
| 交流电流表 |
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56. | alternating supercurrent |
| 超导交流 |
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57. | alternating current characteristic |
| 交流特性 |
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58. | alternating-current supervision |
| 交流控制 |
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59. | alternating current system |
| 交流制 |
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60. | first hand exchange |
| 直接交流 |
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