面对塑料门窗大的发展趋势，所有中小企业都必须回答一个问题，就是自己怎么办？出路无非这么几条：一是联合起来专业协作，共同迎接大企业的挑战；二是被大企业兼并，或主动向大企业靠拢，专门生产某种产品；三是自己有条件，再去扩大生产规模，但这要受许多条件限制；四... Faced with the development trend of plastic doors and windows, all SMEs must answer a question, that is, how to do it? The way out is nothing more than this: First, unite and professionally collaborate to meet the challenges of large companies. Second, it is the merger of large companies, or take the initiative to move closer to large companies, specializing in the production of a product; the third is their own conditions, go to expand production Scale, but this is subject to many conditions; four...