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71. | electron echo experiment |
| 电子回声试验 |
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72. | pulsed echo ultrasonoscope |
| 回波反射式超声诊断仪 |
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73. | supersonic echo sounder |
| 超声波回声测深仪 |
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74. | second trace echo |
| 第二次扫描回波 |
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75. | pulse echo technique |
| 脉冲反射探伤法 |
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76. | spill-over echo |
| 超折射效应回波 |
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77. | acoustic echo repeater |
| 回声重发器 |
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78. | foetal echo meter |
| 胎儿回声测量仪 |
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79. | full echo suppressor |
| 全回波抑制器 |
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80. | tion echo sounder |
| 水平回声探鱼仪 |
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