Symmetrical diazo compounds, compositions comprising them, method of coloring, and device.
对称重氮化合物，含有它们的组合物，染色方法和设备。
2
A method of lamination technology to produce complex material insulating cover suitable for high speed diazo printer is reported, by using nonbasic gloss fibre cloth and unsaturated resin.
报导了采用层敷工艺，使用无碱玻璃纤维布和不饱和树脂研制适于高速晒图机使用的复合材料绝缘机罩的方法。
3
A new spectrophotometric method for the determination of trace nitrite was studied. The method is based on the diazo - reaction of methylene violet with nitrite in hydrochloric acid medium.