A:该粒子是相对稳定结构
B:该粒子核外电子数为36
C:硒原子易失去两个电子
D:硒属于非金属元素
Young Club ____(found) two years ago to provide training for students and unemployed young adults aged 18 to 21.
求下圆的直径和半径.
c=100.48厘米
d=____厘米
r=____厘米
“相逢点点头,握手问个好;感情要真诚,语言要美好”。这句话告诉我们( )