打火机的燃料稍加压即可以液化,减压后(打开开关)液体又容易气化,遇明火即燃烧。上表中可做打火机燃料的是____
分解因式:4a2﹣b2=____.
Look at my()
It is recognized that computers will never ____ ____ ____ ____ human beings despite its convenience.