isolu分离, 隔绝, 隔离ISOabbr.国际标准化组织(=International Standards Organization)isothiuronium salts异硫脲盐isosceles trapezoid等腰梯形isochroic extension等容延伸isomorphic statement同构语句isotopic replacement同位素置换isotopic composition同位素组成isobutyric anhydride异丁酸酐iso-linolenic acid[医] 异亚麻酸, 异十八碳三烯酸isothermal expansion等温膨胀isopycnic separation等密度分离