A:氧气
B:水
C:纯碱(Na2CO3)
D:氢氧化钙Ca(OH)2
- do you know that?
- I looked it up on the Internet. ( )
下列句子中划线成语使用恰当的一项是( )
Paul stayed up late to watch the soccer game last night and now he feels very .
若两个圆的周长比为3:7,则它们的面积比为( )