某种商品每件的进价为30元,在某段时间内若以每件x元出售,可卖出(100﹣x)件,则将每件的销售价定为____ 元时,可获得最大利润.
一个几何体的三视图如图所示,则这个几何体的表面积等于( )
Some ______ and ______ will come to visit our school next month.
My sister ______ goes to bed early because she needs a lot of sleep every day.