引言:几年来真是大有变化:1976年第一次微波管会议是在平静的、稳定的、平淡的商业气氛下进行的。有些管种的经济情况是衰弱下去,而另外一些管种原则是好转的。几家微波管制造公司已经在他们的生意中按排好了微波管部份的增长与減缩。他们没有计划要进打那种“上马”或“下与”的重大变动。 同1976年市场调查相反,最近四年内已经看到对微波管数 Introduction: There have been many changes in the past few years: The first microwave tube conference in 1976 was conducted in a calm, steady and plain business climate. The economic situation of some species is weakening, while others are improving. Several microwave tube manufacturing companies have arranged their microwave tube growth and reduction in their business. They have no plans to enter the major changes that have been “launched” or “made”. In contrast to the 1976 market survey, the number of microwave tubes has been seen in the last four years