搜题请搜索小程序“爱下问搜题”
问题 填空题

定义集合运算：A⊗B={z|z=xy（x+y），x∈A，y∈B}．已知集合A={1，2}，B={2，3}，则集合A⊗B的所有元素之和为______．

答案

∵A⊗B={z|z=xy（x+y），x∈A，y∈B}．

又∵A={1，2}，B={2，3}，

当x=1，y=2时，z=6，

当x=1，y=3时，z=12，

当x=2，y=2时，z=16，

当x=2，y=3时，z=30，

∵6+12+16+30=64

故集合A⊗B的所有元素之和为64

故答案为：64

单项选择题

()标志着中国资本市场区域性试点推向全国，全国性资本市场由此开始发展。

A．上海证券交易所和深圳证券交易所正式营业

B．第一家专业证券公司——深圳特区证券公司成立

C．国务院证券管理委员会和中国证监会成立

D．《证券法》正式颁布并实施
查看答案
填空题

When I tell people that I’m a professor of communication, they often are confused (1) what the term "communication" means. Many people think mass communication is the (2) type of communication, but mass communication is only one form of communication. The study of mass communication focuses on messages that are (3) over (4) such as television, newspapers, and radio. Other areas of (5) focus on the messages individuals send to one another. Some of the major contexts in which communication is studied (6) the interpersonal context, the organizational context, and the intercultural context. A scholar studying (7) communication, for example, might examine how married couples (8) with misunderstandings and the effects these misunderstandings have on (9) satisfaction. Organizational communication scholars, on the other hand, might study (10) the communication styles used by managers and their subordinates influence productivity and efficiency in a company or factory.
My area of specialization is intercultural communication. Intercultural communication is an (11) field of study which incorporates research from disciplines (12) as social psychology, sociology, cultural anthropology, sociolinguistics, and of course, communication. One of the (13) important areas of research addressed by intercultural scholars is how misunderstandings can be (14) when people communicate with Others from different (15) . To understand the process of intercultural communication, we must study how individuals’ cultural backgrounds (16) their communication behaviors.
The area of intercultural communication is a relatively new (17) of study even in the United States. While most Chinese students studying communication in the United States (18) on mass communication, there are some who are interested in intercultural communication and plan to return to China to teach and (19) research in this area. The work of these Chinese scholars on intercultural communication is important because it will help improve (20) between Chinese and Americans in the future.
查看答案