聚光束 meaning in English

convergent pencil of rays

Paper and board - measurement of specular gloss - 75 gloss with a converging beam , tappi method
纸和纸板.光泽度的测量.用聚光束的75度, tappi法
Paper and board - measurement of specular gloss - part 1 : 75 . gloss with a converging beam , tappi method
纸和纸板.光泽度测量.第1部分: 75度聚光束, tappi法
Paper and board - measurement of specular gloss - 20 degree gloss with a converging beam , tappi method
纸和纸板.光泽度的测量.用聚光束的20 ?光泽度的tappi法
Paper and board - measurement of specular gloss - part 1 : 75 gloss with a converging beam , tappi method iso 8254 - 1 : 1999 ; german version en iso 8254 - 1 : 2003
纸和纸板.光泽度测量.第1部分: 75度聚光束, tappi法