下列各组粒子的半径依次减小的是[ ]
A.Mg、Si、Cl、Cl-
B.K、Na、Li、Li+
C.Na+、Mg2+、Al3+、F-
D.I、Br、Br-、Cl-
答案:B
我们吃的蔬菜中,属于繁殖器官的是( )
A.白菜、油菜
B.金针菜、胡萝卜
C.番茄、菜花
D.洋葱、豆角
A project team includes five people,then the project manager adds two more.How many additional channels of communication are there
A.7.
B.10.
C.21.
D.11.