盒子中装有7个红球,2个黄球和1个蓝球,每个球除颜色外没有其它的区别,从中任意摸出一个球,这个球不是红球的概率为______.
摸到的球不是红球的概率是310.
视觉障碍包括
A.视野缺损
B.视力障碍
C.视觉失认
D.眼球运动障碍
E.体象障碍
The heavy snow lasted a few days so that many villages were cut off, thus causing much inconvenience to the villiagers
A.cut out
B.cut off
C.cut up
D.cut through