输出方先开的对开信用证
back-to-back credit export first
输入方先开的对开信用证
back-to-back credit import first
对（对二甲胺苯偶氮）苯磺酸钠[盐]
p-(p-dimethylaminophenyl-azo)benzenesulfonic acid sodium salt
methyl orange
α-型相对信息
relative information of type
帮助互开对
helping opening mutually couple
锻头对开模
heading open dies or heading split dies
对〔（对叔丁基苯基）－偶氮基〕杯[4]芳烃
p-(p-tert-butyl-phenylazo) calix[4] arene