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| 71. | LF spectrum analyzer |
| 低频频谱分析仪 |
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| 72. | all-bottom sound |
| 低频声 |
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| 73. | line transformator |
| 线路变压器|传输线变压器 |
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| 74. | low frequency radio telescope |
| 低频无线电望远镜 |
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| 75. | series transformator |
| 串联变压器|电流变压器 |
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| 76. | LF signal generator |
| 低频信号发生器 |
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| 77. | ringdown signaling |
| 低频监察信号 -用低频电流传送监察信号 |
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| 78. | low frequency radio astronomy |
| 低频射电天文学 |
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| 79. | ELF communication |
| 极低频通信 |
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| 80. | lower limit frequency circuit |
| 低频限制电路 |
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