题目内容

My grandfather used to have a beautiful gold pocket watch.He wore it on a fine gold chain across the front of his waistcoat,and when 1 was small he promised to leave it to me in his will.“When I’m gone,”he said,“this is going to be yours.”Unfommately that will never happen now.About three months ago,my grandfather came up to London to visit US.The first Sunday morningafter he arrived,my youngest son said he wanted to go to the park.“We’11 do better than that.”said my grandfather, "we’ll go and feed the pigeons in Trafalgar Square." So off they went. Theygot home about teatime and my grandfather was looking very upset. "My watch," he said, "it’sgone. Someone must have stolen it while we were feeding the pigeons.\ What did the grandfather use to have The grandfather used to have a beautiful______

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有如下程序#include <iostream>using namespace std;class Apublic:virtual void func1 () cout<<"A1"; void func2() cout<<"A2"; ;class B: public Apublic:void func l() cout<<"B1"; void func2() cout<<"B2"; ;int main() A *p=new B;p->func1();p->func2();return 0;运行此程序,屏幕上将显示输出( )。

A. B1B2
B. A1A2
C. B1A2
D. A1B2

络合滴定曲线描述了滴定过程中溶液pH变化的规律性。

A. 对
B. 错

年等额回收额法既适用于投资额不等的项目比较优选,也适用于项目投资额相等的项目比较与优选。 ( )

A. 对
B. 错

在不同的pH值范围内,指示剂颜色会随pH值而变化,因此必须控制合适的pH值范围。

A. 对
B. 错

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