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4．3计划的变化1993年秋季接触的那些公司在1991年计划时只打算购买4台个人计算机。事实上，这些公司在1991～1993年间购买了ZI台个人计算机，在1994年一季度还打算再买6台。新的个人计算机中有几台用于野外数据采集，或者计划用于野外作业。选作野外使用的是“笔记本式”或“
4.3 Changes to the Plan Those companies contacted in the fall of 1993 plan to purchase only 4 personal computers in 1991. In fact, these companies bought ZI personal computers between 1991 and 1993 and planned to buy six more in the first quarter of 1994. Several new personal computers are used for field data acquisition or are planned for field operations. Selected for field use is “notebook” or "