题目内容
(请给出正确答案)
[主观题]
瓶子里装有浓度为21%的盐水5009,现在分别加入3009的盐水A和7009的盐水B后,瓶子里的盐水
浓度变为19%。现已知所加的盐水A中所含盐分是盐水B的2倍,问盐水A的浓度为多少?
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A.18%
B.23%
C.30%
D.40%
A.7%
B.7.12%
C.7.22%
D.7.29%
A.10%
B.12.5%
C.15%
D.17.5%
()。
A.7%
B.7.12%
C.7.29%
D.7.32%
A.9.2%
B.9.4%
C.9.6%
D.9.8%
A.2.O%
B.2.4%
C.2.5%
D.3.0%
A.2.0%
B.2,4%
C.2.5%
D.3.0%
A.5%
B.6%
C.8%
D.10%
A.取样笼
B.重力管
C.撞锤管
D.气体闭锁装置
A.70%
B.72.5%
C.77.5%
D.80%