翻译: The data on human and animal needs currently available are used by nutrition scientists to establish estimates of amounts of essential nutrients per day that will meet the needs of most health people.
【简答题】Ag 2 O 2 是银锌碱性电池的正极活性物质,可通过下列方法制备:在KOH加入适量AgNO 3 溶液,生成Ag 2 O沉淀,保持反应温度为80,边搅拌边将一定量K 2 S 2 O 8 溶液缓慢加到上述混合物中,反应完全后,过滤、洗涤、真空干燥得到固体样品.反应方程式为 2AgNO 3 +4KOH+K 2 S 2 O 8 △ . Ag 2 O 2 ↓+2KNO 3 +2K 2 SO 4 +2H 2...