The purpose of the 1st experiment was to explore the effects of ph on the activity of the hydroxylase peroxide by adding a 3% volume peroxide solution in the 2 ml new formulation in the 1st, 2nd and 3rd tubes, then adding l ml distillation to the 1st tube, adding 1 ml (equal) sodium hydroxide solution to the 2nd tube, adding 1 ml (equal) hydrochloric acid solution to the 3rd tube and oscillating test tubes。2 the analysis of the subject is

Scientific knowledge on sanitary towel quality standardsIn recent days, the issue of the quality of sanitary towels on the internet has become one of the hot spots of concern. This paper is based on the technical indicators, techniques and provisions set out in the national standard gb/t 8939-2018 " sanitary towels " , providing a brief reading of consumer concerns and clarifying some misunderstandings in a scientific and realistic manner。