问题 单项选择题 A1型题

关于性激素,下列哪项正确()

A.排卵前,卵泡外膜细胞是产生雌激素的主要场所

B.雌激素在月经周期中仅出现一次高峰

C.在整个月经周期中,黄体的寿命为10~12天

D.血中70%的雌二醇与血浆中性激素结合蛋白结合

E.雌二醇是雌三醇和雌酮的代谢产物,其活性最弱

答案

参考答案:D

单项选择题
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;