下列实验能达到目的的是 ()
“退一步,海阔天空;让三分,风平浪静”。这说明在交往中要( )
—You have lots of friends,right?
—Yes. I go,I am willing to make new friends.
抛物线y=12x2,y=-3x2,y=x2的图象开口最大的是( )