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14 天
VDE:以德式严谨护航创新
奥芬巴赫是德国西部的一座小城,距同在美因河畔的法兰克福仅十几分钟的车程。这座被称为法兰克福“连体城市”的小城,正是已经拥有135年历史的VDE检测认证研究所总部所在地。
高考网
29 天
2025年高考高中化学所有实验知识以及流程总结
18.酸(或碱)流到桌子上,先加NaHCO3溶液(或醋酸)中和,再水洗,最后用布擦。 19.检验蔗糖、淀粉、纤维素是否水解时,先在水解后的溶液中加NaOH溶液中和H2SO4,再加银氨溶液或Cu(OH)2悬浊液。 20.用pH试纸时,先用玻璃棒沾取待测溶液涂到试纸上,再把试纸的颜色跟 ...
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