How many decibels is safe noise level fixed by the World Health Organisation for a city ? विश्व स्वास्थ्य संगठन (WHO) ने एक शहर के लिए कितने डेसीबल (dB) को सुरक्षित शोर स्तर तय किया है ?
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सही उत्तर: (A) 45 dB
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