engineering recuitment APSC AE Civil 2020 Test Series Environmental Engineering Air and Noise Pollution

दिन औऱ रात के समय में शांत क्षेत्र में अनुमत रव स्तर क्रमशः _________होंगे।

1
65 dB और 55 dB
2
55 dB और  50 dB
3
70 dB और 60 dB
4
50 dB और 40 dB
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