206.
Choose the correct interrogative sentence.
Düzgün sual cümləsini seçin.
Выберите правильное вопросительное предложение.
When was the first tool for ultrasonic experiments invented?
When the first tool for ultrasonic experiments was invented?
When the first tool for ultrasonic experiments invented?
Was when the first tool for ultrasonic experiments invented?
When the first was tool for ultrasonic experiments invented?
207.
Translation from English.
Ingilis dilindən tərcümə.
Перевод с английского языка.
Choose the correct translation.
Düzgün tərcüməni seçin.
Выберите правильный перевод.
Electronics belongs to the twentieth century, although many of its aspects were worked out earlier.
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