现将100g20%的稀硫酸加水稀释为10%的稀硫酸,需加水的质量为[ ]
A.100g
B.200g
C.300g
D.400g
答案:A
现将100g20%的稀硫酸加水稀释为10%的稀硫酸,需加水的质量为[ ]
A.100g
B.200g
C.300g
D.400g
答案:A
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