Some people like decumentaries because they learn about h____and other things.

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• Some people like decumentaries because they learn about h____and other things.请问这个空怎么填?
• Some people like decumentaries because they learn about h____and other things.
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• 某化合物的化学式为HnRO2n,则R的化合价为______,若R的化合价为奇数,R的氧化物的化学式为：