engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Environmental Engineering Air and Noise Pollution

स्वच्छ, शुष्क और वायुमंडलीय वायु के संघटन में आर्गन सामग्री की मात्रा प्रतिशत में कितना होगी?

1
0.93%
2
0.032%
3
20.95%
4
78.09%
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