 |
| |||
| photometric standard | |||
| luminous standard ruler; photometric standard (器); photometrical standard (器) | |||
| 光度 标准: 19 phrases in 7 subjects |
| Aviation | 3 |
| Lighting other than cinema | 1 |
| Plastics | 1 |
| Shipbuilding | 1 |
| Space | 3 |
| Technology | 9 |
| United States | 1 |
|
| |||
| photometric standard | |||
| luminous standard ruler; photometric standard (器); photometrical standard (器) | |||
| 光度 标准: 19 phrases in 7 subjects |
| Aviation | 3 |
| Lighting other than cinema | 1 |
| Plastics | 1 |
| Shipbuilding | 1 |
| Space | 3 |
| Technology | 9 |
| United States | 1 |