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1 前言1984年,为进一步发展采矿事业,国家经委决定对南芬铁矿的主要生产设备(包括矿用汽车)进行更新改造。根据当时国情,决定购买价格便宜(约为新品的三分之一)的二手设备。为此,经对美国和加拿大30多个矿山的考察,综合各种因素,最
1 Introduction In 1984, in order to further develop the mining industry, the State Economic and Trade Commission decided to upgrade and revamp the main production facilities (including mining vehicles) of Nanfen Iron Mine. According to the prevailing conditions, decided to buy cheap (about one-third of new products) used equipment. To this end, after more than 30 mines in the United States and Canada, the investigation, a combination of various factors, most