题目内容
简述原子吸收分析法的特点。
查看答案
搜索结果不匹配？点我反馈
更多问题
为什么进行直接电位测量时，通过系统的电流必须很小
Dear Mr. Brown:It was a pleasure to talk with you last Thursday about the executive secretarial position in your company. Your company seems to have an extremely efficient and friendly office staff; I know that I would enjoy the challenge of working in this company.Thank you for giving me so much of your time. I look forward to hearing from you again.Sincerely yoursLi Hua
简述荧光光度分析法的定义及特点。
John F. Kennedy was the youngest American to be elected president of the United States. During the World War Ⅱ John F. Kennedy had an outstanding record in the Navy. After the war Kennedy worked briefly as a newspaperman, then entered politics. He was three times elected to the House of Representatives before becoming a senator from Massachusetts. In 1960 he was elected president in a very close race in which there were charges of irregularities.Kennedy’ s term of office was marked by the achievements in appeals to idealism, a broad participation of people in politics, and improved civil rights. In international affairs, Kennedy saw the failure of the American-backed invasion of Cuban missile crisis which brought Russia and the United States to the brink of war.The Kennedy family has experienced victories and tragedy. One of John Kennedy’ s sisters was mentally backward and an old brother was killed in the war. John Kennedy was assassinated—as was his brother, Robert Kennedy. The family has suffered scandals of sex, alcohol, and drugs in both John’ s generation and in this present generation. Many believe that for the young, wealth and a prominent family too much, too soon, too easy are more of a curse than a help. We learn from the second paragraph that（）
微信支付 
支付宝支付