bulb blackening造句

"bulb blackening"是什么意思   

例句与造句

  1. This greatly accelerates the bulb blackening, in comparison with evaporation-only.
  2. In 1913, Irving Langmuir found that filling a lamp with inert gas instead of a vacuum resulted in twice the luminous efficacy and reduction of bulb blackening.
  3. It's difficult to find bulb blackening in a sentence. 用bulb blackening造句挺难的

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