We'll have a holiday next month.
A:five-days
B:five-day
C:five days
D:five day
将同一长方体分别水平与竖直放置在水中,如图所示,它所受到的( )
My mother often tells me the teacher in class .
向CuSO4溶液中加入一定质量的锌粉,充分反应后过滤,得到滤渣和蓝色滤液.下列判断正确的是( )