A.Cobalt, chromium and tungsten
B.Cobalt, vanadium and nickel
C.Nickel, copper and zinc
D.Nickel, zinc and aluminium
E.Copper, tin and lead
A.Cobalt, chromium and tungsten
B.Cobalt, vanadium and nickel
C.Nickel, copper and zinc
D.Nickel, zinc and aluminium
E.Copper, tin and lead