元素的化学性质主要取决于[ ]
A．核外电子数
B．核电荷数
C．中子数
D．最外层电子数
答案：D
— Do you still remember her?
— Certainly, and I _____ her as much as I do now for a long time.
[ ]
A. don't miss
B. haven't missed
C. am not missing
D. didn't miss
计算机网络的通信子网由通信链路和______组成。
