半结构化数据中,不同实体具有的属性会有一定程度的不同。( )
A. 对
B. 错
二维表属于半结构化数据。( )
A. 对
B. 错
Most economists use the aggregate demand and aggregate supply model primarily to analyze ()
A. short-run econimc fluctuations in the economy.
B. the effects of macroeconomic policy on the prices of individual goods.
C. the long-run effects of international trade policies.
D. productivity and economic growth.
Which of the following typically rises during a recession? ()
A. consumption
B. unemployment
C. corporate profits
D. automobile sales
微信支付 
支付宝支付