单项选择题 Which of the following is (are) the basic social conflict(s)? A、the conflict between productivity and the relations of production, and the conflict between the economic base and superstructures B、class conflict C、distribution conflict D、ideological conflict

单项选择题 通常将向固体表面引入微观粒子束，包括质子，光子，电子等的方法称为表面探针。（ ）

单项选择题 一般的缓冲区用队列做为数据结构。 A、正确 B、错误