我处于1975年10月从瑞士威尔特厂引进DI—10红外测距仪,先后在山东、河北、云南等地,不同地形等级,不同气候情况下,进行了生产使用。第一次是1976年5月至8月,在××线进行铁路新线初测导线测量,共测导线380公里。该线河西地势平坦,河东属丘陵地带,气候干燥,风沙较大, I was in October 1975 from the introduction of Switzerland Wiltshire plant DI-10 infrared rangefinder, successively in Shandong, Hebei, Yunnan and other places, at different terrain levels, under different climatic conditions, the production and use. The first time was from May to August 1976, measuring the initial test line for the new railway line on line XX, with a total of 380 km of test lines. The line Hexi flat terrain, Hedong is a hilly region, the climate is dry, large sand,