A:分子的大小
B:相对分子质量的大小
C:带电荷的多少
D:溶解度
图1
Fresh food is good for you . But you have to _______it first because sometimes it is a little dirty.
下列物质在健康人体的内环境通常不出现的是()
She can`t throw the ball in the basket. It`s for her.