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【简答题】
多种氧化物，根据下列信息推断它们的化学式： （1）某铁的氧化物中铁元素的化合价为+3价，氧元素的化合价为-2价，则该铁的氧化物的化学式为 。 （2）某铁的氧化物可还原得到铁，化学方程式为 +4CO 3Fe + 4CO 2 ，则“ ”中铁的氧化物的化学式为 。
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take up
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take over
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take in
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take off
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take up
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take on
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take down
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to be taken
B.
to take
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be taken
D.
taken
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A.
taken
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took
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taking
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