按照圖畫出所示圖形,求剖面線區(qū)域的面積。()
A.3145.3510 B.3145.3015 C.3145.3105 D.3145.3051
A.3221.9245 B.3221.9542 C.3221.9425 D.3221.9452
A.2919.1315 B.2919.1153 C.2919.1535 D.2919.1513