A.Fe3O4、Fe2O3、FeO | B.FeO、Fe2O3、Fe3O4 |
C.FeO、Fe3O4、Fe2O3 | D.Fe2O3、Fe3O4、FeO |
56 |
56+16x |
3 |
2 |
4 |
3 |
4 |
3 |
3 |
2 |
A.35% | B.34.3% | C.17.15% | D.16.8% |
A.1 | B.2 | C.3 | D.4 |
A.①>②>③>④ | B.③>②>①>④ | C.②>③>①>④ | D.④>②>③>① |
A.1:1 | B.1:2 | C.l:3 | D.l:4 |
A.20% | B.40% | C.60% | D.80% |
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