是指国家、企业和个人为了达到一定的目的,直接或间接地对房地产的开发、经营、管理所进行的投资活动。

听力原文：W: I'm exhausted. I stayed up the whole night writing my report.M: Why do you always wait fill the last minute?Q: What can we learn about the woman?(5)A．She has a bad working habit.B．She wakes up early.C．She always goes to bed too late.D．She's an excellent worker.

A.
M:
B.She
C.
B．She
D.
C．She
E.
D．She's
F.

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刚性防水屋面的细石混凝土防水层的厚度不应小于( )，并应配置钢筋网片。

A.30mm
B．40mm
C．50mm
D．60mm

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