物质问纷繁复杂的转化关系是化学的魅力所在，下列选项中物质的转化在一定条件下不能实现的是（ ）
选项 转化关系
A Si
SiO2
Si
B NO2
HNO3
NO2
C Fe
FeCl3Fe
d SSO2
S
| A．A | B．B | C．C | D．D |
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