A:氢化物沸点:HI>HBr>HCl>HF
B:原子半径:K>Cl>S
C:分子稳定性:HF>HCl>HBr>HI
D:单质熔点:Li<Na<K<R
— Liu Xiang won the 110-meter hurdling gold at the 11th National Games again.
— He is always a super star in my heart. Congratulations to him.
从 2 ,0,π,3.14,6这5个数中随机抽取一个数,抽到有理数的概率是( )
0.000000017用科学记数法表示:____.