题目内容
(请给出正确答案)
[单选题]
杯中原有浓度为60X的酒精溶液200ml,重复以下操作2次,倒出100ml溶液,加入100ml水,充分混合。问杯中酒精溶液的浓度约变成了多少?()
A.60%
B.30%
C.15%
D.7.5%
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A.60%
B.30%
C.15%
D.7.5%
A.60%
B.30%
C.15%
D.7.5%
A.9%
B.7.5%
C.4.5%
D.3.6%
A.9%
B.7.5%
C.4.5%
D.3.6%
A. 9%
B. 7.5%
C. 4.5%
D. 3.6%
A.20%
B.20.6%
C.21.2%
D.21.4%
A.100
B.150
C.200
D.250
A.20%
B.20.6%
C.21.2%
D.21.4%
A.20%
B.20.6%
C.21.2%
D.21.4%
A.20%
B.20.6%
C.21.2%
D.21.4%