【简答题】茶是我国人民喜爱的饮品。某校化学兴趣小组的同学设计以下实验来定性检验茶叶中含有钙、铁、铝三种金属元素。查阅部分资料:草酸铵[(NH 4 ) 2 C 2 O 4 ]可溶于水;草酸钙(CaC 2 O 4 )难溶于水;Ca 2+ 、Al 3+ 、 Fe 3+ 完全沉淀的pH:Ca(OH) 2 pH≥l3;Al(OH) 3 10≥pH≥5;Fe(OH) 3 pH≥3.7。试根据上述过程及信息填空 试根据上...
【判断题】职场新人在工作初期带有很大的理想主义色彩,过于美化现实、美化职业,对工作生活的期望值较高。
【单选题】当整车离合器系统排气后储油罐内油量应保持罐体容量的
【简答题】A People living on parts of the south coast of England face a serious problem. In 1993, the owners of a large hotel and of several houses discovered, to their horror, that their gardens had disappeare...