下列关于化学键的各种叙述中正确的是( )
A:在离子化合物中,只存在离子键
B:共价化合物里,一定不存在离子键
C:非金属元素之间只能形成共价键
D:由共价键形成的分子一定是共价化合物
____÷____=____(条)……____(条)
答:每条小猫得到____条小鱼,还剩下____条.
— Is your father free these days?
—No. He has mountains of work to do. He gets up early and comes back late every day.