(一) 自行车,作为一种人类劳动的产品,具有实用性和审美性。自行车的实用性,主要反映在它的内在质量、牢固、安全、耐用,骑行轻快、舒适,自行车的审美性,主要表现在它的外在形式上,即式样新颖、油漆鲜艳、镀铬光亮、装饰美观,能使人 (i) Bicycles, as a product of human labor, are practical and aesthetic. The practicality of bicycles is mainly reflected in its intrinsic quality, firmness, safety, durability, light and comfortable cycling, and the aesthetic appeal of bicycles, which are mainly manifested in its external form, namely novel style, bright paint, bright chrome plating, Beautiful decoration, can make people