题干
The man had expected to see all his relatives when in hospital, but _________ came to see him while many of his friends offered him their help.
A：none
B：no one
C：someone
D：anyone
答案(点此获取答案解析）
A
,装的水恰好占其容积的一半；
表示水平的桌面,容器一边
紧贴桌面，沿
（如图），设翻转后容器中的水形成的几何体是
，翻转过程中水和容器接触面积为
,则下列说法正确的是（ ）