当你的朋友过生日时,你要说:
A:Happy birthday to you.
B:How are you?
When the children saw the snake, they all ran away in fear.
主族
周期
IA
IIA
IIIA
IVA
VA
VIA
VIIA
0族
2
①
②
③
3
④
⑤
⑥
⑦
⑧
4
⑨
下列自然现象中的“水”物质,都表现为固态的是( )