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【单选题】
现有 A,B 两种等渗溶液(混合后两者不起化学反应),下列情况仍为等渗溶液的是A.
任意体积 A 溶液与任意体积 B 溶液混合
B.
A 溶液与 B 溶液等体积混合后再用蒸馏水稀释一倍
C.
A 溶液与 B 溶液等体积混合后再浓缩一倍
D.
A 溶液与 B 溶液混合不可能成为等渗溶液
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