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【单选题】
等压下加热 5 %的下列水溶液,最先沸腾的是( )A.
葡萄糖（ C 6 H 12 O 6 ）溶液
B.
丙三醇（ C 3 H 8 O 3 ）溶液
C.
尿素（ (NH 2 ) 2 CO ）溶液
D.
蔗糖（ C 12 H 22 O 11 ）溶液
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