单项选择题下列关于小球做圆周运动的说法,错误的是( )。 A 运动路径是一个闭合的圆 B 运动路径可以使用椭圆工具绘制 C 小球要转换为元件 D 引导层在小球层的上方
单项选择题One difference between the procedures used to obtain an understanding of internal control and procedures used to test those controls is that tests of controls are more extensive. ( )