7. Cast iron is obtained by remelting
A. wrought iron and pouring into moulds
B. pig iron and pouring into moulds
C. iron ore and pouring into moulds
D. steel and pouring into moulds
7. Cast iron is obtained by remelting
A. wrought iron and pouring into moulds
B. pig iron and pouring into moulds
C. iron ore and pouring into moulds
D. steel and pouring into moulds