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| optical wedge (light-absorbing wedge of uniformly increasing density); neutral density wedge (light-absorbing wedge of uniformly increasing density); continuous wedge | |||
| neutral wedge | |||
| neutral gray wedge; wedge filter | |||
| gray-wedge; grey-wedge | |||
| gray wedge | |||
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Graukeil : 2 短语, 2 学科 |
| 光学（物理学分支） | 1 |
| 技术 | 1 |