• 2022-07-26
    设 [img=13x19]18031b81938c17e.png[/img] 为抛物线[img=81x26]18031b819b8b634.png[/img]上自点 A(-1,0) 到点 B(1,0)的一段弧,则曲线积分[img=218x48]18031b81a6987b7.png[/img]=_____________
    A: [img=34x43]18031b81af009a1.png[/img]
    B: [img=34x43]18031b81b76b302.png[/img]
    C: [img=24x43]18031b81beb32c6.png[/img]
    D: [img=9x43]18031b81c7483fb.png[/img]