根据货币政策中介指标的选取标准，可以作为中介指标的金融变量主要有：利率、货币供应量、超额准备金和（）等。
参考答案：基础货币
用划线单词的反义词填空。
1. Beijing is a ___________ city. Shijiazhuang is a small city.
2. Danny is quiet, but Jenny is ___________.
3. He came here at six. I ___________ there at six, too.
4. The desk is old, but the chair is ___________.
5. A bus is ___________. An airplane is fast.
一个完整的热水供应系统中的两大循环系统为：第一循环系统主要由热源、水加热器、和热媒管网组成；第二循环系统主要由（）组成。
