题目:(2005年江苏省第15届初中应用物理知识竞赛复赛试题)(九年级)从“计划经济”走向“市场经济”,其特征之一就是由“卖方市场”到“买方市场”的变化,生产厂家的产品必须适应市场(用户)的需求.以家用电热淋浴器为例,科技人员曾考虑过两种设计方案:一种方案是“预热式”(带有 Title: (The 15th Jiangsu Provincial Applied Physics Knowledge Competition Rematch Questions in 2005) (Nineth Grade) From the “planned economy” to the “market economy,” one of its characteristics is the change from the “seller’s market” to the “buyer’s market.” The manufacturer’s products must be adapted to the needs of the market (users). Taking home electric showers as an example, scientists and technicians have considered two design options: One is “preheating” (with