机架的作用是什么?有哪几种类型?
参考答案:
机架的作用是用于安装托辊。有落地式和吊挂式两种形式。
(71) analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the(72)for designing and constructing an improved system. (73) is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called(74) . (75) is another such technique that integrates data and processConcerns into constructs called objects.
A.Structured analysis
B.Information Engineering
C.Discovery Prototyping
D.Object-Oriented analysis
下面程序的执行结果为#include"iostream"using namespace std;class A int a; public: void Seta(int x)a=x; void Display_a( )cout<<a<<endl;;class B int b; public: void Setb(int x)b=x; void Dispaly-b( ) cout<<b<<endl;;class C:public A,private B private: int c; public: void Setc(int x,int y,int z)c=z;Seta(x);Setb(y);void Display_c( ) cout<<c<<endl;; ①void main( ) ② ③ C cc; ④ cc.Seta(1); ⑤ cc.Display_a( ); ⑥ cc.Setc(2,2,3); ⑦ cc.Dispaly-b( ); ⑧ cc.Display_c( );
A.输出为2 2 3
B.有错误在第5行
C.输出为1 2 3
D.有错误在第7行