问题 单项选择题

下列说法错误的是()。

A.ASF是流媒体文件的扩展名

B.WAV是另一种视频文件格式

C.ASF支持任意的压缩/解压缩编码方式

D.ASF可以使用任何一种底层网络传输协议,具有很大的灵活性

答案

参考答案:B

解析:WAV是音频文件格式。ASF是一种数据格式,音频、视频、图像以及控制命令脚本等多媒体信息通过这种文件格式,以网络数据报的形式传输,实现流式多媒体内容的发布。ASF支持任意的压缩/解压缩编码方式,并可以使用任何一种底。层网络传输协议,具有很大的灵活性。

单项选择题
单项选择题

Attempts to understand the relationship between social behavior and health have their origin in history. Dubos (1969) suggested that primitive humans were closer to the animals (1) they, too, relied’upon their instincts to stay healthy. Yet some primitive humans (2) a cause and effect relationship between doing certain things and alleviating (3) of a disease or (4) the condition of a wound. (5) there was so much that primitive humans did not (6) the functioning of the body, magic became an integral component ofthe beliefs about the causes and cures of heath (7) Therefore it is not (8) that early humans thought that illness was caused (9) evil spirit. Primitive medicines made from vegetables or animals were invariably used in combination with some form of ritual to (10) harmful spirit from a diseased body.

One of the. earliest (11) in the Western world to formulate principles of health care based upon rational thought and (12) of supernatural phenomena is found in the work of the Greek physician Hippocrates. The writing (13) to him has provided a number of principles underiying modern medical practice. One of his most famous (14) , the Hippocratic Oath, is the foundation of contemporary medical ethics.

Hippocrates also argued that medical knowledge should be derived from a (15) of the natural science and the logic of cause and effect relationships. In this (16) thesis, On Air, Water, and Places, Hippocrates pointed out that human well-being is (17) by the totality of environmental (18) : living habits or lifestyle, climate, geography of the land, and the quality of air, and food. (19) enough, concerns about our health and the quality of air, water, and places are (20) very much written in twentieth century.

14()

A.attractions

B.subscriptions

C.contributions

D.functions