engineering recuitment NMDC Maintenance Assistant Fitter 2021 Mock Test Fitter Pipes and Pipe Fittings

खाली दिलेल्या झडपांमध्ये एक-मार्गी झडप कोणती आहे? 

1
नियंत्रक झडप 
2
गोलक झडप 
3
द्वार झडप 
4
तबकडी झडप
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