A.Nickel, chromium and vanadium
B.Nickel, copper and vanadium
C.Nickel and copper
D.Nickel and chromium
E.Nickel, lead and zinc
A.Nickel, chromium and vanadium
B.Nickel, copper and vanadium
C.Nickel and copper
D.Nickel and chromium
E.Nickel, lead and zinc