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【单选题】
H 2 O - NaCl - Na 2 SO 4 的物系中 Na 2 SO 4 与 H 2 O 能形成水合物 Na 2 SO 4 ·10 H 2 O D. ,在 DBC区中存在的是:A.
水合物 D 与溶液
B.
水合物 D.NaCl和组成为F的溶液
C.
水合物 D . NaCl 和 Na 2 SO 4 三相共存
D.
纯 NaCl .纯 Na 2 SO 4 和水溶液
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