题目

硝酸溶解废旧 CPU所得溶液中含有 Cu2+ 和 Ag+ ，用适当浓度的盐酸、氯化钠溶液、氨水和铁粉，按照如下方法回收 Cu和 Ag（图中标注的试剂均不同）。 （ 1）加入过量 Fe粉发生的主要反应为 ______（写化学方程式）。 （ 2）试剂 1和试剂 3的名称依次是 ______。 （ 3）若向 66g物质 1中加入 100g试剂 2后，恰好完全反应，剩余固体质量为 60.4g，求所得溶液中溶质的质量分数（写出计算过程，计算结果精确到 0.1%）。 阅读下列短文，从所给的四个选项中，选出最佳答案 　A Frenchman nicknamed（绰号叫）spiderman climbed one of Hong Kong's shining golden skyscrapers（摩天大楼）last week, avoiding guards and police until he reached the top of the 48-storey building． 　Without the use of any equipment, Alain Robert, a 34-year-old Parisian, took just half an hour to get to the top of the skyscraper．Robert, wearing a black T-shirt and jeans, climbed up by supporting himself on window frames（边，框）and stretching between them, hardly stopping for breath． 　Bystanders held their breath from fear, pointing to what looked like a black spider（蜘蛛）moving up the golden glass wall．Firemen called to the scene also kept a close watch on his climb． 　On reaching the top of the skyscraper, Robert raised his arms in victory．As an experienced rock climber, he told reporters he had also climbed other buildings around the world, including the Golden Gate Bridge in San Francisco． 　Robert was later taken away for questioning by police who said he must answer for his alarming（令人惊恐的）action． (1)  How many kinds of persons, including the climber himself, are referred to in this passage?　　　[　　] A．Six．　　　B．Five．　　　C．Four．　　　D．Three． (2)  Which of the following is NOT true?　　　[　　] A．Robert had climbed plenty of other tall buildings all over the world． B．His climbing the skyscraper was so dangerous that some bystanders felt nervous． C．Robert had planned to climb the Golden Gate Bridge in San Francisco． D．Neither guards nor police noticed him when he began to climb the skyscraper． (3)  Robert managed to climb the skyscraper by using ______ ．　　　[　　] A．a rope B．a good tool C．a hook（钩子） D．nothing (4)  He fearlessly climbed the skyscraper probably because ______ ．　　　[　　] A．he preferred climbing　　　　　B．he hoped to get a reward C．he wanted to set a record　　　 D．he was really a madman (5)  From the lines we can see that ______ ．　　　[　　] A．Robert was probably as cruel as a poisonous spider B．Robert felt very tired when reaching the top of the skyscraper C．Robert's bravery would be praised by the Hong Kong government D．Robert might be punished for climbing the skyscraper