—______ is the hamburger?
—It’s two dollars. [ ]
A. How old
B. How much
C. How many
答案:B
下列程序中需要清理动态分配的数组,划线处应有的语句是______。#include<iostream, h>class person int age, tall;public: person() age= 0; tall= 40; cout<<"A baby is born. "<<end1; person(int i) age=i, tall=40, cout<<"A old person. "<<end1; person(int i, int i) age = i; tall = j; cout <<" a old person with tall. "<< end1; ~person( ) cout<<" person dead. "<<end 1; void show() cout<<"age= "<<age<<" ,tall= "<<tall<<end1; ;void main() person * ptr; ptr = new person[3]; ptr[0]=person ( ) ptr[1]=person(18); ptr[2]=person(20,120); for(int i=0;i<3; i++)ptr[i]. show( ); ______
产尘强度指生产过程中,采落煤中所含的粉尘量,常用的单位为()。
A.g/t
B.g/m³
C.kg/t
D.kg/m³