试题源程序文件清单如下：
//main.cpp
#include＜iostrcam.h＞
class vehicle
private:
int MaxSpeed;
int Weight;
public:
//**********found**********
vehicle(int maxspecd,int weight): (1)
～vehiclc();
int getMaxSpeed()return MaxSpeed;
int getWeight()return Weight;
:
//**********found**********
class hicycle: (2) public vehicle
pnvate:
int Height;
public:
bicycle(int maxspeed ,int weight,int height):vehicle( maxspeed ,weight), Height( height)
int getHeight()return Height;;
;
//**********found**********
class motorcar: (3) public vehicle
private:
int SeatNum:
public:
motorcar( int maxspeed,int weight,int sealnum):vehicle( maxspeed, weight), SeatNum( seatnum)
int getSeatNum()return SeatNum;;
;
//**********found**********
class motorcycle: (4)
public:
motorcycle( int maxspeed ,int weight,int height):
vehicle( maxspeed ,weight), bicycle( maxspeed, weight, height), motorcar( maxspeed, weight,1)
;
void main()
motorcycle a(80,150,100);
cout＜＜a. getMaxSpeed()＜＜endl;
cout＜＜a. getWeight()＜＜endl;
cout＜＜a. getHeight()＜＜endl;
cout＜＜a. getSeatNum()＜＜endl;

某数据库中有表COURSE(CNO，CNAME，TNO)和表TEACHER(TNO，TNAME，DE- PART)，完成查询选修某课程的同学人数多于5人的教师姓名。
SELECT TNAME
FROM TEACHER WHERE
(4)
(SELECT X.TNO FROM COURSE X，COURSE Y
WHERE (5)
(6)
(7)
)
事务是数据库执行的基本单位，如果一个事务执行成功，则全部更新提交；如果一个事务执行失败，则已做过的更新被恢复原状，好像整个事务从未有过这些更新，这就是保持数据库处于 (8) 状态。