按照?qǐng)D畫出所示起重機(jī)吊鉤,求尺寸A的數(shù)值。()
A.223.3903 B.223.9603 C.223.9903 D.223.9973
按照?qǐng)D畫出所示密封片,求剖面線區(qū)域的面積。()
A.3511.7402 B.3511.7403 C.3511.7401 D.3511.7405
按照?qǐng)D畫出所示蓋板,求剖面線區(qū)域的面積。()
A.5795.9766 B.5795.9767 C.5795.9776 D.5795.9677