当平面平行于圆柱轴线截切时,截交线的形状是();当平面垂直于圆柱轴线截切时,截交线的形状是圆;当平面倾斜于圆柱轴线截切时,截交线的形状是()。
参考答案:两平行直线;椭圆
It is the prevention of disease ______ its successful treatment that has led to the rapid increase of the
world's population. [ ]
A. rather than
B. more than
C. other than
D. less than
下列各项中,应记人营业成本的有()。
A.出售原材料结转的材料成本
B.随同商品出售且不单独计价的包装物成本
C.出租固定资产计提的折旧
D.提供劳务收入结转的成本