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| 71. | level surveying |
| 水准测量学 |
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| 72. | level acceleration |
| 平飞加速 |
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| 73. | level adjustment |
| 水平调准 |
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| 74. | level variation |
| 电平变动 |
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| 75. | level converter |
| 电平变换器 |
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| 76. | level regulator |
| 液位调节器，液面调节器 |
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| 77. | level instrument |
| 测量水平仪；水准仪；液面测量仪 |
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| 78. | level theodolite |
| 水准经纬仪 |
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| 79. | level monitoring |
| 电平监测 |
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| 80. | concentration level |
| 浓度级 |
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