如图①所示的组合几何体,它的下面是一个长方体,上面是一个圆柱.
(1)图②和图③是它的两个视图,在横线上分别填写两种视图的名称(填“主”、“左”或“俯”);
(2)根据两个视图中的尺寸,计算这个组合几何体的体积.(结果保留π)
解:(1)如图所示:
;
(2)2×5×8+π×(2÷2)2
a、b在数轴上位置如图所示,则a、b、﹣a、﹣b的大小顺序是( )
根据句意及汉语提示,写出各单词的正确形式,每空填一词。
What ____ (尺寸)of shoes does your father wear?
What a____ (浪费) to order so much food for us two!
I like the nights with thousands of____ (星星)in the sky.
It's not dark in the room. Please don't turn on the light too____(早)