为了更好的演示几何关学实验的，GY—II激光光学演示仪被研制出来了。
工艺采用冷锻、热打、切削，GY为本厂产品的注册商标。
从鸭梨、苹果、枣、葡萄等水果的果皮中筛选出了一株适于鸭梨酒酿造的酵母菌，命名为GY。
GY-3 depressant is added to Jingan crude oil and Wuqi crude oil individually and on-site test is made in Jingma pipeline.
We use cold-forming, hot-striking and cutting to produce the products. The products registering trade mark is GY.
