A:由原子核和核外电子构成
B:核电荷数等于核外电子数
C:质量主要集中在原子核上
D:是一个实心球体
下列关于性状和基因的关系,描述正确的一项是( )
(2016•十堰)- I shouted to you at the gate, but you didn't hear me.
- Really? I ____ a telephone call to my mother.