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【单选题】
目前对人类威胁最大的疾病主要是脑血管病、心血管病和恶性肿瘤，构成这些疾病的最重要因素是( )A.
细菌
B.
营养不良
C.
寄生虫
D.
病毒
E.
心理和社会
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【简答题】传递细胞:
【简答题】传递细胞最显著的特征是______，是与______功能有关。
【简答题】medical technologies
【简答题】传递细胞
【单选题】The Internet is based on which three key technologies?
A.
The Internet is based on which three key technologies?
B.
Client/server computing, packet switching, and HTTP
C.
Client/server computing, packet switching, and the development of communications standards for linking networks and computers
D.
TCP/IP, HTML, and HTTP
【简答题】传递细胞
【单选题】With multimedia technologies, people can do the following EXCEPT
A.
throwing away their radios and TVs.
B.
holding meetings or talking with others far away.
C.
learning new concepts and technologies more easily
D.
working more effectively with powerful office applications.
【简答题】传递细胞最主要的特点是______，其功能是______。
【单选题】Which of the following is true of push and pull technologies?
A.
The early Web was characterized by pushing static information.
B.
In push technologies, organizations provide users with standardized information.
C.
In pull technologies, organizations provide users with customized information based on each user's individual profile.
D.
In pull technologies, users research, find, request, and retrieve the information they want.
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