java程序中可以定义多个类,但______类最多只能有—个。
参考答案:公共
一个钢质的圆柱体零件重1763.424克,它的侧面展开图是一个长方形,长方形的长(不是圆柱体的高)是18.84厘米,求这个圆柱体的高(每立方厘米钢重7.8克).
They considered ______a computer, which was considered ______a great help in their work.
A.to buy; to be
B.buying; being
C.to buy; being
D.buying; to be