A:反应后溶液中不存在任何沉淀,所以反应前后Cu2+的浓度不变
B:在Cu(NH3)4 2+离子中,Cu2+给出孤对电子,NH3提供空轨道
C:用硝酸铜溶液代替硫酸铜溶液进行实验,不能观察到同样的现象
D:沉淀溶解后,将生成深蓝色的配合离子Cu(NH3)4 2+
Bob and Sue are in the same school,1they are in different classes.After school,Bob and Sue often play games with their friends.Class begins at eight in the morning.Now Bob and Sue are in2own classrooms.They are3to their teachers.Bob is studying English.Sue is having an art lesson.She4to make a birthday card5her mother.
Her teacher Miss Li is helping her.
在下列什么位置傅科摆的摆动方向相对下方的刻度盘不会发生偏转( )。