——Of all the skirts, the red one looks as ______ as the others.——I think so. And it's _______ than the others.
若2x-1x-3在实数范围内有意义,则x的取值范围是( )
有下列五个命题:①对顶角相等;②内错角相等;③垂线段最短;④带根号的数都是无理数;⑤一个非负实数的绝对值是它本身.其中真命题的个数为( )
在“探究什么情况下磁可以生电”的实验中,连接了如图所示的实验装置.