“世界建设(World Construction)”杂志于1979年初发函向世界各地的建筑承包商(用户)进行了一次“民意测验”式的调查,征询他们在采购一些主要的施工机械时所愿选择的制造厂家的名称。选择分为第一选择、第二选择、第三选择三档。该杂志根据收到的答复汇总后列表,按用户选择数目的多少排成名次,以1980年赠刊形式发表。被征询的建筑承包商共1500家,收到答复的有403家,答复者的地区分布如下表: “World Construction” magazine sent a letter to “construction contractors” (users) around the world in early 1979 to conduct a “opportunity poll” survey to ask them about the manufacturing they would like to purchase when purchasing some major construction machinery. The name of the manufacturer. The choice is divided into the first choice, the second choice, and the third choice. The magazine compiled the list based on the responses received, ranked according to the number of users’ choices, and published them in 1980 as a gift. A total of 1500 construction contractors were consulted, and 403 were responding. The respondents’ regional distribution is as follows: