下列不属于工程咨询单位发展目标的是( )。
A．市场目标
B．贡献目标
C．盈利目标
D．核心目标
参考答案：D
开标时间应当在( )中确定。
A．资格预审文件
B．投标邀请书
C．招标文件
D．投标文件
Which of the following types of unemployment is most likely to be associated with an economy in which many workers have been made obsolete by changing technology（）
A. Cyclical.
B. Marginal.
C. Structural.
