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1·Our company specialized in manufacturing and managing of tyre changer, wheel balancer, aligner, lifter and nitrogen gas machine. Five series and more than twenty models.

本公司主要生产经营各种型号的轮胎拆装机、轮胎平衡机、四轮定位仪、举升机、氮气机等五大系列20多个品种的产品。

2·The specific parameters of main optical system are deduced from the requirement of pattern transfer for the projection aligner. The limit of these parameters is discussed.

本文从投影光刻机的图形传递要求出发，导出投影光刻机各主要光学系统的具体要求，并讨论这些参数确定的局限性。