实验
序号
蜡块
干松木
体积V/cm3
质量m/g
①
10
9
5
②
20
18
③
30
27
15
④
40
36
20℃时，将一杯接近饱和的食盐水不断恒温蒸发水分，表示水分蒸干之前其溶质的质量分数随时间变化的关系的曲线是 ( )
The Foreign Minister said,“ our hope that the two countries will work towards peace.”
