题目内容

RC电路的时间常数是( )。

A. 电路整个充电过程的时间
B. 电路整个放电过程的时间
C. 充电时,电容的端电压达到最大值的1/e(36.8%)时所需要的时间
D. 放电时,电容的端电压达到最大值的1/e(36.8%)时所需要的时间

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RC电路的R不变,C变小,其时间常数将( )。

A. 增大
B. 减小
C. 不变
D. 不确定

程序填空题:求1到10000之间有多少个完数?#includevoidmain(){intx,j,sum,n;n=____1_____;for(x=1;x<=10000;______2_______){sum=0;for(j=1;j

程序填空题:输出1到10000之间的所有完数。#includevoidmain(){intx,j,sum;for(x=1;x<=10000;x++){______1______;for(j=1;_____2_____;j++)if(_____3________)sum+=j;if(x==sum)printf("%d是完数\n",x);}}

2.Directions:In this section, you are going to read a passage with ten statements attached toit. Each statement contains information given in one of the paragraphs. Identify the paragraph from which the information is derived. You may choose a paragraph more than once. Each paragraph is marked with a letter. Answer the questions by marking the corresponding letter onAnswer Sheet 2

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