临沂王先生来我们工厂学习花岗岩打磨翻新护理技术！（如下图） 
                                                                              
                                                                                龚经理在给王先生讲解花岗岩理论知识                          龚经理教王先生操作大水牛打磨花岗岩翻新技术   

                                                                              
                                                                                            花岗岩晶面效果图                                                                       花岗岩晶面效果图