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| метод измерения при помощи прерывистого светового луча; метод мигания (Methode der fotometrischen Messung, bei der auf denselben Empiänger abwechselnd Meß- und Vergleichslicht fallen) | |||
| Wechsellichtmethode: 1 phrase in 1 subject |
| Optics branch of physics | 1 |
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