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Engineering
The discipline, art, skill and profession of applying scientific knowledge and principles to the design and manufacturing of machines, structures, devices, systems, materials and processes.
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pH 平衡
Personal care products; Shampoo
潛在的氫-措施的酸度或鹼度的解決方案。Ph 解決方案級別小於 7 是酸性，那些與 ph 值大於 7 是基本的。雖然基礎知識將展開並軟化頭髮 酸會變硬的頭髮。為此，很多洗髮香波和空調是 pH 平衡 (ph 值 4-6 級) 來匹配的頭髮、 皮膚自然的酸堿值水準。 ...
