【简答题】某化学学习小组在实验室中探究铁钉与热浓硫酸的反应。其探究流程如图所示: (1)从实验安全的角度考虑,应先向烧杯中加入______(填“甲”或“乙”)。 (2)根据加入的反应物的量,实验需要选取的烧杯的规格为________(填字母序号)。 a.50 mL b.100 mL c.500 mL d.1 000 mL (3)上述流程图中从“静置”后的混合物中得到上...
【单选题】I think you feel happier when you try to look good. It is natural to feel better if you feel you look good; even in nature, cats climp themselves too. I do not mean we should all be the same, but for ...