具有数式存储和二元回归直线处理功能的大连DS—5型和日本EL—5002型等电子计算器是目前用于物料成份分析中较为理想的袖珍计算器。它们能将计算公式先存储起来,到时只按动一个“计算键”输入公式中一个或多个变量值,再按动一次该键即能得出结果,做到了快、简和准。 上述计算器都是一键两功能,如(?)。第一功能(方框内所注)是直接按该键,即 Dalian DS-5 and Japan EL-5002 electronic calculators with the functions of digital storage and binary regression line processing are the most suitable pocket calculators currently used in material composition analysis. They can store the calculation formula first, and then press one “calculation key” to enter one or more variable values ​​in the formula, and then press the key to get the result, which is fast, simple and accurate. The above calculator is a one-key two functions, such as (?). The first function (note inside the box) is to press the key directly, ie