There is a cat ____ (on/near) the box.
—I am very ____ tomorrow's Math test . I am afraid I can't pass this time.
—Cheer up! I'm sure you'll make it.
大于0.3而小于0.5的小数,只有一个0.4.
已知a是实数,则一元二次方程x²+ax-4=0的根的情况是 ( )
下列划线词语注音全部正确的一组是( )
如图所示,装满货物的小车在推力F1和拉力F2共同作用下,在水平地面上向右做匀速直线运动,若F1=50N,F2=60N,则下列说法中正确的是( )