根据《中华人民共和国合同法》，合同权利的效力有（）
A.请求力
B.执行力
C.依法自力实现
D.处分权能
E.保持力
参考答案：A, B, C, D, E
—There is a girl in front of our classroom. Do you know ?
—She is an English teacher.
A．who is she
B．who she is
C．what is she
D．what she is
队列研究有哪三种类型？
