— is the bike?
一 Just $150.
A:How much
B:How many
C:How long
D:How often
下列函数不属于二次函数的是 ( )
— Can I come in?
— ( )
如图所示的四种现象中,其物态变化属于汽化的是( )
如图所示,玻璃罩内的电铃正在发声.用抽气机将空气抽出,铃声变轻最后消失,这说明声音要依靠 ____来传播.