直杆受力如图所示,已知 =10kJ, =1m,-|||-AD段与DE段的横截面积分别为 _(1)=100-|||-^2 _(2)=50(mm)^2 =200GPa, CE段的-|||-变形量为 () m-|||-(A) times (10)^-4-|||-(B) -30times (10)^-4 直杆受力如图所示,已知 =10kJ, =1m,-|||-AD段与DE段的横截面积分别为 _(1)=100-|||-^2 _(2)=50(mm)^2 =200GPa, CE段的-|||-变形量为 () m-|||-(A) times (10)^-4-|||-(B) -30times (10)^-4