垂直单管采暖系统
参考答案：
竖向布置的各组散热器沿一根立管串接的采暖系统。
如果两个图形关于某条直线对称，那么对称轴是对应点连线的______．
Benjamin Franklin, CFA, does research about consumer surplus and producer surplus. The deadweight loss from a perfectly competitive market is most likely:（）
A. greater than the deadweight loss of a monopoly market.
B. less than the deadweight loss of a monopoly market.
C. equal to the deadweight loss of a monopoly market.
