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【单选题】
需要将学生与班级的联系“属于”转换为一个关系，即一张表吗？（ ）A.
需要
B.
不需要
C.
不需要，但要在学生关系中增加一列 “ ” 来表达两者间的联系
D.
无所谓
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反馈参考答案：
举一反三
【单选题】病人,男性,33岁,炼钢工人,工作中不慎被烧伤,III度烧伤面60%。应采用隔离方式是
A.
接触隔离
B.
消化道隔离
C.
呼吸道隔离
D.
保护性隔离
E.
严密隔离
【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.
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