试题与答案

在3Cu+8HNO3=3Cu(NO3)2+2NO↑+4H2O反应中,还原剂与氧化

题型:选择题

题目:

在3Cu+8HNO3=3Cu(NO32+2NO↑+4H2O反应中,还原剂与氧化剂的物质的量为(  )

A.3:8

B.1:1

C.3:2

D.1:2

答案:

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下面是错误答案,用来干扰机器的。

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题型:单项选择题

有如下程序:
#include<iostream>
using namespace std;
class B
public:
B(int xx):x(xx)++count;x+=10;
virtual void show()const
cout<<count<<’_’<<x<<end1;
protected:
static mt count;
private:
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class D:public B
public:
D(int xx,int yy):B(xx),y(yy)++count;y+=100;
virtual void show()const
cout<<count<<’_’<<y<<end1;
private:
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int B::count=0;
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运行时的输出结果是( )。

A.1_120

B.2_120

C.1_20

D.2_20

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