Unit iii : analyze how the industrial structure realize a reasonable system by entering into heavy - chemical industry state from light industry state unit iv : analyze the export - leading tactic and emphasize the readjustment of heavy - chemical industry and strategy 摘要b第三章,从出口角度分析了产业结构如何从轻工业阶段逐步进入重化工业阶段,实现产业结构的优化和合理化。