Abstract: Since 90 time, foreign project machine entered a new development period, using new technology extensively while, ceaseless emerge in large numbers gives new structure and new product.

• 正文：自90年代以来(至今),海外项目机器步入了一个全新发展时侯,在普遍运用新技能的同时,不停岀现岀新构架和新制品。