按照图画出所示图形,求尺寸A的数值。()
A.76.6994 B.76.6949 C.76.6499 D.76.4996
按照图画出所示图形,求剖面线区域的面积。()
A.15672.3682 B.15672.3268 C.15672.3286 D.15672.3826
A.2062.8335 B.2062.8331 C.2062.8353 D.2062.8313