把10克盐放入90克水中搅拌成盐水,盐占盐水重量的10%.______.
10÷(10+90),
=10÷100,
=10%;
答:盐占盐水重量的10%.
故答案为:√.
使用VC6打开考生文件夹下的工程test42_1,此工程包含一个源程序文件test42_1.cpp,但该程序运行有问题,请改正函数中的错误,使该程序的输出结果为: rect area: 12 rectb area: 30 源程序文件test42_1.cpp清单如下:#include <iostream.h>class CRectangle /***************** found *****************/ int *width, height;public: CRectangle (int,int); ~CRectangle (); int area (void) return (*width * *height);;CRectangle::CRectangle (int a, int b) width = new int; height = new int; /***************** found *****************/ width = a; *height = b;CRectangle::~CRectangle () delete width; delete height;/***************** found *****************/void main () CRectangle rect (3,4), rectb (5,6); cout << "rect area: "<< rect.area() << endl; cout << "rectb area: "<< rectb.area() << endl; return 0;
会展经济的基本特征是什么?