题目

  What if you arrived home to find a delicious hot meal waiting for you, prepared by your own kitchen robot? It might sound like science fiction, but professors at the University of Tokyo have taken the first steps toward making that a reality. The team recently introduced a human-shaped kitchen robot that can pour tea and other drinks into cups and serve them to guests. When teatime is over, the robot can also wash the dishes and put them away.   In California, another interesting kitchen robot has been developed, called Readybot. It can pick up objects and either store them in cabi如图，用一根铁丝将四根半径1分米的管子紧紧捆住，（接头处不计）至少要多少分米的铁丝？