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| major principal plane | |||
| main plane | |||
| principal plane | |||
| primary flat | |||
| cardinal plane; principal level | |||
| |||
| H principal plane | |||
| |||
| principal H plane (磁场矢量和辐射最大值方向构成的平面) | |||
| |||
| E principal plane | |||
| |||
| principal E plane (电场矢量和辐射最大值方向构成的平面) | |||
|
主平面 : 33 phrases in 11 subjects |
| Advertising | 1 |
| Air defense | 1 |
| Automobiles | 1 |
| Bridge construction | 1 |
| Chemistry | 1 |
| Engineering geology | 5 |
| Hydroelectric power stations | 1 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 18 |
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