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问题 选择题

玉米根尖分生区细胞会不停地分裂生长。此时这些细胞[ ]

A．两组中心粒会分别移向两极

B．有K+穿过原生质层进入大液泡

C．染色体数目不断减少

D．保持着全能性

答案

答案：D

问答题

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;
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判断题

法制部门是公安机关内部执法监督工作的领导部门。 ( )
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