题目内容

为了在健康人群中发现可疑的乙性肝炎感染者宜用（）。

A. 个案调查
B. 筛检
C. 抽样调查
D. 普检
E. 生态学研究

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小区物业收取进出车辆管理费，业主认为已经缴纳物业费，不应该缴纳管理费，物业就催缴、给车子上锁，你是街道管理人员，怎么处理？

Question 45-48 The horse preceded man on earth. Although the earliest remains of primitive horses have been found on the North American continent, many scientist believe this small species traveled over a land mass in the Bering Sea to found the beginnings of the modern horse in Asia. It became extinct in America. Other scientists believe that the horse may have originated in Asia. In any event the animal soon spread into China, Europe, and the Middle East. The first modern horses to be introduced into the American continent came with the early Spanish explorers. Horses were bred into many types. The heavy horses developed in the low countries of Europe and were used for Arabian. The only true wild horses left in the 20th century are found in Mongolia. Horses are said to rate in intelligence after the ape, elephant, and dog. They have excellent memories and can sometimes find their way home when lost, and sense danger better that their masters. The early civilizations of man that had made use of ht horse developed more rapidly than those which did not. The primary uses of the horse for early man were ___________

A. for food
B. for prestige
C. to make money
D. to work for him

正常成人一次失血1000mL时（）。

A. 血压升高，心率加快
B. 血压降低，心率加快
C. 血压升高，心率减慢
D. 血压降低，心率减慢
E. 心率和血压均不变

采用（ 43）设计模式可保证一个类仅有一个实例：采用（ 44）设计模式可将组合成树形结构以表示“部分 -整体”的层次结构，使用户对单个对象和组合对象的使用具有一致性；采用（ 45）设计模式可动态地给一个对象添加一些额外的职责。（44）处填（）。

A. 命令（ Command）
B. 单例（ Singleton）
C. 装饰（ Decorate）
D. 组合（ Composite）