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【单选题】
如下图所示,H2O-NaCl-Na2SO4的三元系中,Na2SO4 和 H2O能形成水合物Na2SO4•10H2O(D),在DBC区中存在哪几相平衡?( )A.
NaCl-Na2SO4水溶液
B.
Na2SO4 及NaCl两固相及Na2SO4饱和溶液三相共存
C.
Na2SO4 及NaCl两固相及NaCl饱和溶液三相共存
D.
水合物D和Na2SO4 及NaCl三固相共存
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