我国化工系统以基础原材料和农用化学品为主 ,占６８．９３ % ,达接近７０ %的高比例。而合成材料的比重仅为５ %左右 ,明显过低。化学加工工业亦仅占１８．７７ %。我国化工行业内部结构相对落后集中表现为以下两方面 :(１)石油化工所占比重过低。现代化学工业实际上是指石油 China’s chemical system is dominated by basic raw materials and agricultural chemicals, accounting for 68.93%, reaching a high proportion of nearly 70%. The proportion of synthetic materials is only about 5%, which is obviously too low. The chemical processing industry also accounts for only 18.77%. The relatively backwardness of the internal structure of China’s chemical industry is manifested in the following two aspects: (1) The proportion of petrochemical industry is too low. Modern chemical industry actually refers to oil