一、前言为了满足工农业生产、国防、科研的需要和力值传递的迫切要求,在毛主席的独立自主,自力更生,洋为中用方针指引下,在各级党组织的领导下,在有关单位的大力支持下,经过三年多的努力,我们先后用红山试验机厂与长春材料试验机厂生产的弹性体研制成了一 I. Preface In order to meet the urgent demands of the needs of industrial and agricultural production, national defense and scientific research and the transfer of strength, with Chairman Mao’s independence, self-reliance and foreign policy as guideline, under the leadership of party organizations at all levels, With the strong support, after more than three years of hard work, we have successively developed the elastomer produced by Hongshan Testing Machine Factory and Changchun Material Testing Factory