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简述电位法测pH值的基本原理。
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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. What can we learn from this passage（）
M: You’ve bought only 15 orangesW: No, I bought 20 in all. But when I got home, I found five were bad. How many oranges were good（）
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. According to the passage, which of the following is FALSE（）
I’ ll never forget the day my ear broke down. It literally was the middle of the night and we were miles from home. We tried to get it started again, but in vain, and there was no traffic on the road at all, so we couldn’t get a lift. So we had to walk all the way home. To make matters worse, it started to rain and by the time we arrived home about two hours later, we were wet through. But the worse was yet to come! looked in my pockets and Jane looked in hers but there was no key.In the end we realized that one of us (probably me) had left the from door key in the car. We had no choice but to break a window and climb in. Unfortunately just as we were about to climb through the broken window, a policeman arrived on the scene. In the end we convinced him and he let us go in. By the time we eventually got to bed, it was past C o’ clock and we were cold, wet, miserable and absolutely exhausted. What does the speaker think of his experience（）
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