题目内容
(请给出正确答案)
[主观题]
一杯氯化钠溶液,加入一定量的水后浓度变为12%。继续加入同样多的水,浓度变为8%。则第三次
加入同样多的水后浓度应为()。
A.4%
B.6%
C.10%
D.5%
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A.4%
B.6%
C.10%
D.5%
浓度为30%的酒精溶液,加入一定量的水后浓度变为20%,再加入同样多的水后浓度变为()。
A.18%
B.15%
C.12%
D.10%
浓度为30%的酒精溶液,加人一定量的水后浓度变为20%,再加入同样多的水后浓度变为()。
A.18%
B.15%
C.12%
D.10%
A.8%
B.9%
C.10%
D.11%
A.8%
B. 9%
C. 10%
D. 11%
A.14%
B.17%
C.16%
D.15%
A.1%
B.1.2%
C.1.5%
D.1.67%
A14% B17%
C16% D15%
A.14%
B.17%
C.16%
D.15%
A.1.6%
B.1.5%
C.1.2%
D.1%
A.3%
B.2.5%
C.2%
D.1.8%