二类调查前的外业培训工作十分重要。早在五十年代中期的森林经理调查工作中就已经开始进行了。当时开展练习的地点通常是一个区队或在一个流域的几个区队外业地区中具有代表性林分和交通条件较好的地方。集 The second type of field training before the survey is very important. As early as the mid-fifties forest managers survey work has already begun. The practice sites at that time were usually either a district team or several representative areas in a drainage area and areas with good traffic conditions. set