以铁铵钒为指示剂,用硫氰酸铵标准溶液测定银离子时,应在何种条件下进行?
A. 强酸性
B. 弱酸性
C. 强碱性
D. 弱碱性
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挑选成绩:要求输入某个班50名同学数学课的成绩,求出该课程的平均成绩,并将不低于平均成绩的那一部分成绩输出。#include "stdio.h"#include "stdlib.h" //其中包含后面要用到的system函数#define RENSHU 50 //总人数int main(){int 请选择A,i; //定义一维数组用于存放各人成绩//sum用于存放总分,初值为0,average用于存放平均分float sum=0,average;printf("\n请逐个输入全班所有人(%d个)的数学课成绩:",RENSHU);for(i=0;i=average)printf("%4d",chengji[i]);printf("\n");//用system函数调用OS系统命令pause以实现暂停从而方便用户看清结果system("pause");return 0;}
These results are ______ with the findings of the previous study. (consistent, consistency)
The statistics ______ a change in people’s spending habits. (reflect, reflection)
Twenty-five dollars was ______ more than he had expected to pay. (considerable, considerably)