A.加入食盐4g |
B.蒸发水分20g |
C.蒸发水分24g |
D.加入质量分数为8%的食盐水40g |
40g×8% |
40g-x |
40g×8%+y |
40g+y |
A.5% | B.10% | C.19% | D.9.5% |
A.上浮 | B.下沉 | C.不变 | D.无法判断 |
A.16% | B.2% | C.8% | D.4% |
A.加硝酸钾固体5克 |
B.蒸发掉一半溶剂 |
C.蒸发掉50克溶剂 |
D.加入100克10%的硝酸钾溶液 |
A.1:4:5 | B.5:4:1 | C.4:1:5 | D.20:80:100 |
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