短語詞組短語perfectly price elastic 水平的perfectly y elastic 完全有彈性perfectly in elastic supply 完全缺乏供給彈性perfectly elastic body 完全彈性躰perfectly elastic demand 彈性;完全彈性需求perfectly elastic supply 完全彈性供給;供給perfectly elastic h 完全有彈性perfectly elastic collision 完全彈性碰撞perfectly elastic plastic 塑性 返回 perfectly elastic