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【单选题】
各种蛋白质中含量相近的元素是A.
碳
B.
氢
C.
氧
D.
氮
E.
硫
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A.
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A.
revising
B.
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C.
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D.
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A.
revising
B.
contradicting
C.
distorting
D.
distracting
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