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【单选题】
有四种水溶液:(甲) 0.2mKOH (乙) 0.1mC 12 H 22 O 11 (丙) 0.2m NH 3 水 (丁) 0.04m BaCl 2 , 它们的凝固点降低值由小到大顺序是
A.
甲，乙，丙，丁
B.
乙，丁，丙，甲
C.
甲，丙，乙，丁
D.
丁，甲，丙，乙
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