按实时电价方法定价，会产生市场盈余，市场盈余的产生主要是由于网络阻塞的存在使不同节点的价格不同。
参考答案：对
--- Zhao Rui, it’s said that many famous singers will come to Yangzhou on April 18th.
How about watching the evening show there?
--- ________! Let’s ask Huang Tao to go with us.
A．Best wishe
B．Sounds great
C．Good luck
D．That’s OK
砖墙的砌筑应遵循内外搭接、上下错缝的原则，上下错缝不小于( )mm。
A．20
B．50
C．60
D．40
