橡胶工业在国民经济上具有十分重要的意义。用橡胶制成的制品广泛地应用在国民经济的各个部门中(图1)。比如,国防上和交通运输上,飞机、汽车用的各种轮胎,军舰、坦克、飞机、炮车上所需要的各种特殊零件,工业上应用的各种胶管、胶板、电器绝缘物,医药卫生上所需要的一些医疗用具,生活上常 The rubber industry has a very important significance in the national economy. Articles made of rubber are widely used in various sectors of the national economy (Figure 1). For example, in defense and transportation, various kinds of tires used in aircrafts and automobiles, various special parts required for warships, tanks, airplanes, and artillery vehicles, various hoses, rubber sheets, and electrical insulation used in industry, Some medical equipment required for medical and health care