皮皮学，免费搜题
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【单选题】
配制100ml 0.5%.盐酸普鲁卡因溶液，需加人多少克氯化钠使其成等渗(1%.盐酸普鲁卡因水溶液的冰点下降度数为0.12℃，1%.的氯化钠水溶液的冰点下降度数为0．58℃)A.
0.45g
B.
0.90g
C.
0.48g
D.
0.79g
E.
0.05g
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