 |
| |||
| orientation flat; primary flat | |||
| cardinal plane; principal plane | |||
| |||
| principal reference plane | |||
|
plan principal : 8 短语, 5 学科 |
| 卫星通讯 | 1 |
| 地球科学 | 2 |
| 电子产品 | 1 |
| 航空 | 3 |
| 营销 | 1 |
|
| |||
| orientation flat; primary flat | |||
| cardinal plane; principal plane | |||
| |||
| principal reference plane | |||
|
plan principal : 8 短语, 5 学科 |
| 卫星通讯 | 1 |
| 地球科学 | 2 |
| 电子产品 | 1 |
| 航空 | 3 |
| 营销 | 1 |