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【单选题】
会话层的功能是：A.
实现主机间通信
B.
应答网络连接请求
C.
解析语音信息
D.
与网络进行会话
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举一反三
【简答题】下面说法中正确的是( )。 A)在WWW服务器中不需要设定默认网站文档，因为WWW服务器已经设定了初始文档地址 B)在WWW服务器中需要设定默认的网站文档 C)在WWW服务器中不需要设定默认的网站文档，WWW服务器随机生成 D)以上均不正确
【单选题】Refer to Exhibit 3-13. A movement from Point D to Point F:
A.
increases the level of unemployment.
B.
requires the sacrifice of cupcakes in order to acquire more cakes.
C.
requires the sacrifice of cakes in order to acquire more cupcakes.
D.
is not possible given the available resources and technology.
【单选题】Refer to Exhibit 3-1. In the circular flow model:
A.
households receive income from businesses in exchange for providing inputs and use that income to buy goods and services from businesses
B.
businesses receive revenues from households in exchange for providing goods and services and use those revenues to buy inputs from households.
C.
households receive revenue for selling goods and services to businesses, and use that revenue to buy inputs from businesses.
D.
Both a. and b. are correct.
【单选题】Refer to Exhibit 3-13. The opportunity cost of producing an additional cake:
A.
increases as the economy moves in a southeast direction along the production possibilities curve.
B.
decreases as the economy moves in a southeast direction along the production possibilities curve.
C.
remains constant as the economy moves in a southeast direction along the production possibilities curve.
D.
equals zero.
【单选题】Refer to Exhibit 3-3. A movement from Point B to Point C:
A.
involves sacrificing bread in order to produce a greater quantity of wine.
B.
involves sacrificing wine in order to produce a greater quantity of bread.
C.
involves no sacrifice, as the opportunity cost of production is zero everywhere along the production possibilities curve.
D.
will increase the level of unemployment in the economy.
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