单选题DNA复制时新链的合成是

单选题肺褐色硬化多见于

单选题A．K + 外流 B．Ca 2+ 内流 C．两者均有 D．两者均无 (2002年)

单选题下列关于呼吸商的描述，错误的是

单选题哪项不符合肾动脉粥样硬化

单选题引起肺气肿的最重要原因是

单选题In a democratic society citizens are encouraged to form their own opinions on candidates for public office, taxes, constitutional amendments, environmental concerns, foreign policy, and other issues. The opinions held by any population are shaped and manipulated by several factors: individual circumstances, the mass media, special-interest groups, and opinion leaders. Wealthy people tend to think differently on social issues from poor people. Factory workers probably do not share the same views as white-collar, nonunion workers. Women employed outside their homes sometimes have perspectives different from those of full-time homemakers. In these and other ways individual status shapes one's view of current events. The mass media, especially television, are powerful influences on the way people think and act. Government officials note how mail from the public tends to "follow the headlines. " Whatever is featured in newspapers and magazines and on television attracts enough attention that people begin to inform themselves and to express opinions. The mass media have also created larger audiences for government and a wider range of public issues than existed before. Prior to television and the national editions of newspapers, issues and candidates tended to remain localized. In Great Britain and West Germany, for example, elections to the national legislatures were usually viewed by voters as local contests. Today's elections are seen as struggles between party leaders and programs. In the United States radio and television have been beneficial to the presidency. Since the days of Franklin D. Roosevelt and his "fireside chats," presidents have appealed directly to a national audience over the heads of Congress to advocate their programs. Special-interest groups spend vast sums annually trying to influence public opinion. Public utilities, for instance, tried to sway public opinion in favor of nuclear power plants. Opposed to them were citizens' organizations that lobbied to halt the use of nuclear power. During the 1960s the American Medical Association conducted an unsuccessful advertising campaign designed to prevent the passage of Medicare. Opinion leaders are usually such prominent public figures as politicians, show-business personalities, and celebrity athletes. The opinions of these individuals, whether informed and intelligent or not, carry weight with some segments of the population. Some individuals, such as Nobel Prize winners, are suddenly thrust into public view by the media. By quickly reaching a large audience, their views gain a hearing and are perhaps influential in shaping views on complex issues.

单选题结核性腹膜炎的病变性质通常属于

单选题下列哪期接受心室额外刺激后，可出现期前收缩和代偿间歇

单选题下列属于系统性自身免疫病的是

单选题甲状腺间质钙化灶中出现骨组织，病变属于

单选题A.入睡时B.午夜C.清晨D.上午

单选题A．蛋白质B．甘油三酯C．葡萄糖D．胆固醇

单选题心室肌的后负荷是指( )(1991年)

单选题精氨酸浓度增加使尿素合成加速的机制是

单选题电刺激下丘脑防御反应区导致的舒血管效应主要见于

单选题下列选项中，符合肿瘤的异质性概念的是

单选题下列不属于癌前病变的是

单选题调节红细胞生成最主要的体液因素是

单选题风湿性心肌炎病理诊断的主要依据为