建立派生类对象时，3种构造函数分别是a(基类的构造函数)、b(成员对象的构造函数)、c(派生类的构造函数)这3种构造函数的调用顺序为（ ）。
A．数据库管理系统、数据库应用系统
B．数据库管理系统
C．数据库应用系统、数据库管理系统、操作系统
D．数据库应用系统
参考答案：C
解析：纵栏式报表是在一页中主体节内显示一条或多条信息，而且以垂直方式显示。
I’m a middle school student. I think my life isn’t really . Let me tell you it. I go to school from Monday to Friday. I get up before 7:30 in the morning, because I always go to bed late at night. After getting up, I wash my face (洗脸) and brush teeth. I a healthy breakfast at 7:40. At 8:00, I walk to the bus stop. I take a to school. It takes 20 minutes to get there. School finishes at 14:30. When I get home, I do my and study until (直到) 17:00. After that, I my mother make dinner. We have dinner at 18:00. Then I always my friends on the computer. We talk about many things. I go to bed at 22:30. My school days are boring, the weekends are another (另一种的) story. How is your life?
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