Study on Extraction of Oolong Tea Assisted by Ultrasonic Wave and 4C Technique and Its Application                                      
                                    
                                         作者: Guofeng YU2, Cuishu LENG2, Keli FANG3, Zhiguang LIU2, Jianhong SUN2,Zengyu Wang2,  Xuegang LI1,Shuai Zhang2,  Jian LIU1, Xulun WEI1, Qiulin LIU1, Shoujie NIE1*