【说明】Point是平面坐标系上的点类，Line是从Point派生出来的直线类。 #include ＜iostream.h＞ class Point {public:Point (int x, int y) ;Point (Point &p) ;～Point();void set (double x, double y) ;void print(); private:double X,Y; }; Point::Point (int x, int y) //Point 构造函数 {X=x; Y=y; } Point::Point ( (1) ) //Point 拷贝构造函数 {X=p.X; Y=p.Y；} void Point::set (double x, double y) {X=x; Y=y; } void Point::print() {cout＜＜’ (’＜＜X＜＜","＜＜Y＜＜") "＜＜endl; } Point::～Point() {cout＜＜"Point 的析构函数被调用! "＜＜endl; class Line: public Point {public: Line (int x, int y, int k) ; Line (Line &s) ; ～Line(); void set (double x, double y, double k) void print(); private:double K; }; (2) //Line 构造函数实现 { K=k;} (3) //Line 拷贝构造函数实现 {K=s.K;} void Line::set (double x, double y, double k) { (4) ; K=k; } void Line::print() {cout＜＜" 直线经过点"; (5) ; cout＜＜"斜率为: k="＜＜K＜＜endl; } Line: :～Line() {cout＜＜"Line 析构函数被调用! "＜＜endl; } void main() {Line 11 (1,1,2) ; 11 .print(); Linel2 (11) ; 12.set (3,2,1) ; 12.print(); }

呕吐伴剧烈头痛常见于（）

A.青光眼

B.急性胰腺炎

C.胆道梗阻

D.急性溶血

E.脑血栓形成