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【问题5】 在HFC双向网络中一般采用什么载波调制方式
【问题4】 假设有一个50M的文件从终端用户上传至服务器，需要的最短时间是多少
Questions 57 to 61 are based on the following passage. The president of the United States has one of the toughest jobs in the world. Hardly anyone else is watched so closely by so many people. Reporters follow the president patiently, eager for his opinion on everything from nuclear warheads to the outcome of a football match. The president must be careful at all times that his answers to reporters’ questions reflect his policies. In addition, wherever the president may go, he never for a moment escapes the responsibilities of his office. The evening news may show him on a working vacation, but the work is always with him. The job seems to demand a person of outstanding ability, so you might think the US Constitution (宪法) would contain a long list of job qualifications. However, it lists only three. Article Ⅱ , Section 1 of the Constitution states that the President must: 1. be a natural-born citizen of the United States ; 2. be at least 35 years old; 3. have been the resident of the United States for 14 years. While Constitution lists only three qualifications for the President, the voters certainly consider many others. Among these are intelligence, good health, experience in government, ability to lead others, knowledge of national and world affairs, personality, ability to speak well, and persuasiveness. The President is the Chief Executive of the United States and heads the executive branch of the Government. However, the President must share power with members of the other two branches of Government: the legislative. (立法的) branch, or the Congress; and the judicial (司法的) branch, or the federal courts. The Constitution states the powers and duties of the Presidency; it also tells how each branch of the Government is to check the powers of the other two in order to balance the powers and prevent any single branch from abusing its power. This system of checks and balances was designed by the writers of the Constitution because they did not want any one person or branch of the Government to gain too much power. According to the passage, the US President must ______.
Questions 19 to 22 are based on the conversation you have just heard.
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