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【多选题】
证明氟化氢是弱电解质的事实是( )A.
氟化氢在所有卤化氢中热稳定性最强
B.
浓H 2 SO 4 加入氟化钙固体中，加热，有氟化氢气体产生
C.
100 mL 0.1 mol/L氢氟酸中c(H ＋ )小于0.1 mol/L
D.
测得常温下0.1 mol/L NaF溶液的pH＞7
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