潮流计算中的节点类型有哪几种？（）
A.PQ节点
B.PV节点
C.QV节点
D.平衡节点
参考答案：A, B, D
经济全球化实质上是发达资本主义国家为主导的。[ ]
Lucy liked all the dresses there,but she took the ______ one to save as much money as
possible for Project Hope. [ ]
A. cheaper
B. more expensive
C. cheapest
D. most expensive
