state gov Bihar Police Fireman Mock Test Series General Science Chemistry Basic Concepts of Chemistry

मनुष्य द्वारा सर्वप्रथम प्रयुक्त मिश्रधातु कौन-सी थी?

1
इस्पात (स्टील)
2
काँसा (ब्रोंज)
3
सोल्डर
4
पीतल (ब्रास)
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