在-227,0.54,π3,16,3-2,0.1212121…,0,5-20中,无理数有( )
下列各选项中成语使用正确的一项是( )。
一个边长为4cm的等边三角形ABC与⊙O等高,如图放置, ⊙O与BC相切于点C,⊙O与AC相交于点E,则CE的长为____ cm
-- Which of the two shirts would you like?
-- Well, I have no idea. _______of them look nice.