Question

The composition of Gun metal is 1. 30%-Cu, 67%-Ni, 3%-Fe+Mn 2. 80%-Cu, 20%-Sn 3. 87%-Cu, 10%-Sn, 1%-Zn, 1%-Pb 4. 50%-Cu, 25%Zn, 25%-Ni

Answer 1

Answer:

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