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41. | electric propulsion bus |
| 电力推进汇流排 |
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42. | rocket propulsion |
| 火箭推进 |
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43. | ascent propulsion |
| 上升推进 |
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44. | electric propulsion switchboard |
| 电力推进控制板 |
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45. | missile propulsion system |
| 导弹推进系统 |
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46. | steam electric propulsion |
| 蒸汽电力推进 |
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47. | ship propulsion appliances |
| 船舶推进器 |
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48. | electric propulsion satellite |
| 电力推进卫星 |
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49. | water jet propulsion |
| 喷水推进 |
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50. | emergency propulsion motor |
| 应急推进电动机 |
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