I'm ____ (a,an) rabbit. My eyes ____ (is , are ) red. My nose ____ (is,are) small.
计算题:
如图所示,在倾角为α的斜面上,重为G的小球被竖直的木板挡住,不计一切摩擦,则小球对斜面的压力为____,小球对木板的压力为____.