My hair is too long.
A:You should let it grow.
B:You should get a haircut.
已知三点P1(x1,y1),P2(x2,y2),P3(1,-2)都在反比例函数y=kx的图象上,若x1<0,x2>0,则下列式子正确的是( )
杰出——____
关于重力势能的说法,正确的是( )
读政区图回答: