engineering recuitment OPSC Assistant Industries Officer Mock Test 2025 Environmental Engineering Water Treatment Screening

मध्यम आकार वाले स्क्रीन सीमा में दो बार के बीच कितना स्थान होना चाहिए?

1
20 – 30 mm
2
20 – 40 mm
3
10 – 20 mm
4
10 – 30 mm
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