题目内容
(请给出正确答案)
[主观题]
有两瓶质量为1千克的酒精溶液,浓度分别为70%和45%,先从两瓶中各取部分混合成1千克的酒精溶液,测
得浓度恰好为50%,再将这两瓶中剩下的溶液混合,则所得酒精浓度是:
A.50%
B.55%
C.60%
D.65%
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A.50%
B.55%
C.60%
D.65%
A.15
B.21
C.27
D.30
A.36%
B. 64%
C. 50%
D. 60%
A.48%
B.50%
C.54%
D.60%
A40.50%
B42.50%
C36.50%
D45.50%
A.5%
B.6%
C.8%
D.10%
A. 5%
B. 6%
C. 8%
D. 10%
A.1
B.1.3
C.1.6
D.1.9