到1990年,欧洲五个主要工业国家(西德、法国、英国,意大利及荷兰)过程型能量控制器的销售额将增长两倍多,达一亿四千万美元。今后十年期间,在需要量增加最快的控制器中,对热能和动力系统同时进行控制的装置,其销售额将增长三倍;其他如电力需 By 1990, sales of process-type energy controllers in Europe’s five major industrial countries (West Germany, France, the United Kingdom, Italy, and the Netherlands) would have more than doubled to $140 million. During the next ten years, in the controllers with the fastest increase in demand, sales of thermal energy and power systems that simultaneously control devices will increase sales by three times; others such as electricity demand