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प्रश्न
State the main components of a hearing aid.
एका वाक्यात उत्तर
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उत्तर
The main components of hearing aid are microphone , amplifier and earphone.
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संबंधित प्रश्न
The sketches I to IV in following Figure show sound waves, all formed in the same time interval.
 |
 |
| I | II |
 |
 |
| III | IV |
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