A.52.8% | B.50% | C.70% | D.48.3% |
| ||
128 |
32 |
x |
m |
| ||
222 |
62 |
y |
m |
111 |
31 |
4m | ||
4m+
|
A.Mg>Al>Fe | B.Al>Fe>Mg | C.Al>Mg>Fe | D.Fe>Mg>Al |
A.90% | B.10% | C.45% | D.54% |
A.原粉末一定是Fe3O4 |
B.原粉末一定是FeO和Fe2O3的混合物 |
C.原粉末一定是纯净物 |
D.原粉末可能是由一种、两种或三种氧化物组成 |
A.1:2 | B.2:1 | C.1:4 | D.4:1 |
A.29% | B.43% | C.50% | D.100% |
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