发布时间:2025-02-04 19:49:43
用猪油制作肥皂,主要是将猪油、氢氧化钠(烧碱)、氯化钠、乙醇等材料进行溶解、加热、烤制等一系列的步骤,油脂在经过与碱作用后,生成皂化液和甘油,经过再提纯和加工后,就制成了肥皂。
房屋封闭式阳台挑出一米五楼层高度三米五请问要多大的挑梁与钢筋
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