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Concentration ratio集中度


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更多 “ Concentration ratio集中度 ” 相关考题
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考题 阅读以下说明和C程序,将应填入(n)处。[说明]某种传感器的输出值Ratio依赖于环境温度temp(-40℃≤temp≤50℃)。对一组环境温度值(ITEMS个),人们已经测量得到了相应的Ratio值(见表1)。该表粗略地描述了曲线Ratio(temp)。校正系数K是Ratio的倒数,因此也依赖于环境温度temp。在数据处理中,人们需要用更多的列表值细致地描述曲线K(temp),如表2所示。在表2中,各温度值所对应的K值是对表1进行线性插值再求倒数得到的,具体的计算方法如下:1.根据temp值,在表1中用二分法查找;2.若找到相应的温度值,则按相应的Ratio值求倒数得到K值:3.若没找到相应的温度值,则可确定temp所在的温度区间[Tp1, Tp2],同时获得了相应的Ratio1和Ratio2,再按如下公式计算K值:Step=(Ratlo1-Ratio2)/(Tp1-Tp2)K=1.0/(Ratio1+Step*(temp-Tp1))在程序中,当temp高于50℃或低于-40℃时,设定K=0。[程序]include <stdio.h>typedef struct {int Temp; /*环境温度*/double Ratio; /*传感器的输出值*/}CURVE;define ITEMS 7double GetK(int, CURVE*, int);void main(){int Degree;double k;CURVE Curve[ITEMS]={ {-40,0.2},{-20,0.60},{-10,0.8},{0,1,0},{10,1.17},{30,1.50}, {50,1.8} };printf("环境温度 校正系数\n");for( Degree= 40; Degree<=50; Degree++){k=GetK(Degree, Curve, ITEMS);printf(" %3d %4.2f\n",Degree,k);}}double GetK(int Temp, CURVE *p, int n){/*用二分法在n个元素的有序表p中查找与Temp对应的传感器输出值*/int low,high,m; double Step;low=0; high=n-1;if((Temp<p->Temp) ||( Temp>(p+high)->Temp))return 0.0; /*超出温度范围时返回0.0*/while (low<=high){m=(1) ;if(Temp==(p+m)->Temp)return (2);if (Temp<(p+m)->Temp)high=m-1;else low=(3);}p+= high;Step=((4))/((p+1)->Temp-p->Temp);return 1.0/(p->Ratio +Step *((5)));}

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