高数课程妥媒血课件 镭理工大理>> 推广 T:x=φp(t),y=y(t),z=0(t).(a≤t≤B) f(x, y, z)ds ∫lq(t),v(t),a(t)lq2(t)+y"(t)+o2(t)t (a<B) Http://www.heut.edu.cn : x = (t), y =(t), z =(t). (  t   ) ( ) [ ( ), ( ), ( )] ( ) ( ) ( ) ( , , ) 2 2 2            =  +  +    f t t t t t t dt f x y z ds 推 广