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在网络的拓扑结构中，处于上层的结点称为 (1) 。只要有一个结点发生故障，网络通信就无法进行的结构是 (2) ；数据单方向传输的拓扑结构是 (3) 。 (4) 允许某些站点具有优先级。交换式局域网属于 (5) 。 5（）
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使用VC++6.0打开考生文件夹下的源程序文件2.cpp。阅读下列函数说明和代码，补充空出的代码。函数IsPalindromes(char *string)实现的功能是判定给定的字符串是否构成回文字符串，如果是则返回1，否则返回0。 例如：abcdcba或者1234321都认为是回文字符串。 如果串为空或一个字母时，均认为是回文字符串。 注意：不能修改程序的其他部分，只能补充IsPalindromes函数。 试题程序： #include＜iostream.h＞ #define MAXLEN 1024 bool IsPalindromes(char *string) void main() char str[MAXLEN]； cout＜＜"请输入一行文字"＜＜end1； cin.getline(str，MAXLEN)； cout＜＜IsPalindromes(str)＜＜end1； return；
史密斯：根据《国际珍稀动物保护条例》的规定，杂种动物不属于该条例的对象。《国际珍稀动物保护条例》的保护对象中包括赤狼。而最新的基因研究技术发现，一直被认为是纯种动物的赤狼实际上是山狗与灰狼的杂交。由于赤狼明显需要保护，所以条例应当修改，使其也保护杂种动物。 张大中：您的观点不能成立。因为，如果赤狼确实是山狗与灰狼的杂交种的话，那么，即使现有的赤狼灭绝了，仍然可以通过山狗与灰狼的杂交来重新获得它。 以下选项中最可能是张大中的反驳所假设的是( )。
用双绞线组网时，在不使用网桥的情况下，网络上可以连接的工作站多达（）个；
A new study claiming to document a connection between violence on television and violence in real life is already coming under attack from academics. They say that the author is demanding action on his report before producing detailed findings to substantiate it.(47) Dr. William Belson told the British Association for the Advancement of Science in Birmingham last week that his research suggested that boys exposed to high levels of television violence were 50 percent more likely to commit acts of violence than boys who had not been exposed.His 110,000 pounds survey, paid for by CBS, the American television company, studied more than 15,000 London boys aged between 12 and 16. He closed his paper with a call for immediate action on his recommendations to reduce levels of TV violence and specific kinds of violence which he claimed were more damaging than others. His recommendations were enthusiastically endorsed by Mrs. Mary Whitehouse.Social scientists familiar with the field have a number of specific queries about Belson’s work. (48) They pointed out that a statistical technique invented by him and central to his research has been criticized by some academics in the past. Robin MrCorn, of the Mass Communication Research Centre at Leicester University, says," Self reporting—asking the subject to give his own account of the evidence is notoriously unreliable. Studies have put the possible error as high as 20 percent, and we don’t know what checks there were in this work. The fact that Belson paid the boys may’ have had an influence. Without the full data, it can’t be checked."McCorn adds:" His questions on the programmes go back 12 years. If the boys were aged between 13 and 16 it means the oldest was only four years old when the first programmes were broadcast. How reliable is the memory of a child that young likely to be on the programmes he watched Dr. Belson may have answers, but we just don’t know."(49) The Nelson affair highlights the difficulties faced by researchers into television violence-problems so severe that at least one British group has withdrawn from the field completely. "It’s impossible to do serious scientific work in his area now," says Robin McCron. "It has moved out of the academic world and it has been taken over by pressure groups and politics."Indeed, experience in television research in America reveals how treacherous this field has become. (50) Results of nervous projects there have been found, at worst, contradictory, at best, inconclusive. They pointed out that a statistical technique invented by him and central to his research has been criticized by some academics in the past.
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