将30℃时一定量的NaNO3饱和溶液升温至50℃(忽略水分的蒸发),肯定改变的是 [ ]
A、溶质的质量
B、溶液的质量
C、NaNO3的溶解度
D、溶质的质量分数
答案:C
Which function is NOT served by building a prototype
A.It takes the place of the final syste
B.It assists in gathering software requirement
C.It assists in estimating the cost of the projec
D.It is used as the foundation of the larger project
离休人员、二等乙级以上革命伤残军人的医疗保险待遇是怎样规定的?