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將400g溶質(zhì)質(zhì)量分?jǐn)?shù)20%的NaCl溶液稀釋成溶質(zhì)質(zhì)量分?jǐn)?shù)為16%的NaCl溶液，需加入水                                                                (    )

   A. 100g   B. 200g   C. 400g   D. 800g

將400g溶質(zhì)質(zhì)量分?jǐn)?shù)20%的NaCl溶液稀釋成溶質(zhì)質(zhì)量分?jǐn)?shù)為16%的NaCl溶液，需加入水                                                                (    )

   A. 100g   B. 200g   C. 400g   D. 800g