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【单选题】
某样品水分测定时，空铝合重20.0000g，加入样品后重22.0000g，经过一定时间的烘干后样品和铝合重21.8000g，因此样品的水分含量是（ ）A.
90%
B.
过程错了
C.
10%
D.
20%
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A.
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E.
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B.
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C.
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D.
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