设计一个基类Vehicle,它具有一个需要传递参数的构造函数,包含两个保护...答:Car(int wl,double wgt,int ps):passengers(ps),Vehicle(wl,wgt){//cout<<"Car()"<<endl;}};class Truck:virtual public Vehicle{protected:double payload;public:Truck(int wl,double wgt,double pl):payload(pl),Vehicle(wl,wgt){//cout<<"Truck()"<<endl;}};class Notchback:...