每天须检查机械设备安全装置的人员是（）。

A、安全员

B、机务员

C、班组长

D、操作者

请使用VC6或使用[答题]菜单打开考生文件夹proj2下的工程proj2，其中定义了vehicle类，并派生出motorcar类和bicycle类。然后以motorcar和bicycle作为基类，再派生出motorcycle类。要求将vehicle作为虚基类，避免二义性问题。请在程序中的横线处填写适当的代码并删除横线，以实现上述类定义。此程序的正确输出结果应为：
80
150
100
1
注意：只能在横线处填写适当的代码，不要改动程序中的其他内容，也不要删除或移动“// ****found****”。
#include ＜iostream.h＞
class vehicle

private:
int MaxSpeed;
int Weight;
public:
//**********found**********
vehicle (int maxspeed,intweight):______
～vehicle();
int getMaxSpeed()return MaxSpeed;
int getWeight()return Weight;
;
//**********found**********
class bicycle:______public vehicle

private:
int Height;
public:
bicycle(int maxspeed,int weight,int height):vehicle(maxspeed,weight),Height(height)
int getHeight()return Height;;
;
//**********found**********
class motorcar:______public vehicle

private:
int SeatNum;
public:
motorcar(int maxspeed,int weight,int seatnum):vehicle(maxspeed,weight),SeatNum(seatnum)
int getSeatNum()return SeatNum;;
;
//**********found**********
class motorcycle:______

public:
motorcycle(int maxspeed,intweight,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;