材料、能源和信息被称为技术的三大支柱。历史有以材料划分时代的。第一次和第二次工业革命又以能源划分时代。第三次工业革命则以信息划分时代。按照科技时代划分，本世纪上半叶属于电力时代，而下半叶属于信息（革命）时代。　　一、电力时代的机械制造业　　１９世纪３０～ Materials, energy and information are called the three pillars of technology. History has been divided by materials. The first and second industrial revolution are divided by energy. The third industrial revolution is divided by the era of information. According to the scientific and technological era, the first half of this century belongs to the power era, while the second half belongs to the era of information (revolution). First, the era of power machinery manufacturing 19th century 30 ~