多项选择题

继网络经济后，（）等新经济形态开始出现。

A.纳米经济
B.低碳经济
C.生物经济
D.重工经济

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单项选择题

W: Excuse me, where can I find the apartment manager?M: Sorry, I can’t help you. I’m not familiar with this building.Q: What does the man mean?（）

A．No one can find the manager's apartment.
B．He helps people find apartments here.
C．His family lives in the apartment building.
D．He has no idea where to find the manager.

单项选择题

下列各项中，潜在的投资利用效率是（）。

A．毕业生发展潜力
B．知识更新率
C．专业改变率
D．专业人员缺员率