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【单选题】
某饱和一元醛中,含碳元素的质量是含氧元素质量的 3 倍,此醛分子式为A.
C 2 H 4 O
B.
C 3 H 6 O
C.
C 4 H 8 O
D.
C 5 H 10 O
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B.
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C.
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D.
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A.
the collapse of human civilization
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A.
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C.
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D.
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