engineering recuitment BPSC AE Mock Test 2025 Draftsman Bridge Engineering Tunnel Rules

सुरंग के लिए भूमिगत वायु की गुणवत्ता में ऑक्सीजन का न्यूनतम प्रतिशत कितना है?

1
12.5'%
2
15.5'%
3
17.5'%
4
19.5'%
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