How much person of iron ore is found in magnetite? |
|||||||
(a) |
70% |
(b) |
72% |
(c) |
60% |
(d) |
75% |
How much person of iron ore is found in magnetite? |
|||||||
(a) |
70% |
(b) |
72% |
(c) |
60% |
(d) |
75% |