What is he busy doing? Doing the experiment ____ (complete) the science project.
已知a为函数f(x)=x3﹣12x的极小值点,则a=( )
如图,△ABC内接于⊙O,AH⊥BC于点H,若AC=24,AH=18,⊙O的半径OC=13,则AB=____.