Using monitored data of air sulphation speed for 1989-2003, the space-time change in (Xi 'an) City is analyzed.
依据1989—2003年监测数据，分析了西安市大气中硫酸盐的时空变化。
2
The results show that when the battery is charged at low current and constant voltage, its failure mode is the sulphation of negative plate and the softening of positive plate;
用优选充电制度，电池失效模式是正极活性物质软化，板栅腐蚀相对较少。
3
The invention relates to a sulphation modification method of codonopsis pilosula polysaccharide, belonging to the traditional Chinese medicine polysaccharide structure modification technical field.