Ⅳ类光源的一般显色指数范围为()。 A.Ra≥80 B.80>Ra≥60 C.60>

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问题:

Ⅳ类光源的一般显色指数范围为()。

A.Ra≥80

B.80>Ra≥60

C.60>Ra≥40

D.40>Ra

考点:电气工程师(发输变电)照明照明题库
题型:单项选择题

阅读短文,根据短文内容填上正确的单词  

    During his life Dr James Naismith worked as a doc-tor, taught P.E. and wrote several books. While he never thought it very important, Dr Naismith is today best known for one thing. He was the inventor of basketball.    

    Dr James Naismith was born in Canada in 1861 and his first job was at a special sports school in the USA.One day the school principal told James he was having a problem with the .students. Because of heavy snow, the students could not go outside. He told James that they needed a sport the boys could play indoors and gave the teacher two weeks to think of something.      

    It was on the very last day that James came up with  his idea. The" birth of basketball "is said to be on Decem- ber 21,1891,when two teams from the school played the first game. It was quite different from the basketball games of today. It had 9 players on each team and foot- balls were used instead of basketballs. Soon after, the game changed t0 5 players on each side, using special  " basketballs" through nets.     

   Although Dr Naismith did not live to see basketball become the worldwide game it is today, in 1936,just three years before his death, basketball became an Olym- pic sport. at the games in Berlin.  

1. Dr Naismith is ________ ________as the inventor of bas-ketball.

2. December 21,1891 was said co be the ________of bas-ketball.  

3. Today basketball has become the________ game.  

4. Dr Naismith died at the age of ________ .

5. Basketball became an________ sport at the games inBerlin in 1936.

题型:单项选择题

请补充main函数,该函数的功能是求方程ax2+bx+c=0的根(方程的系数a,b,c从键盘输入)。
例如, 当a=1,b=2,c=1时, 方程的两个根分别是:
x1=-1.00,x2=-1.00。
注意:部分源程序给出如下。
请勿改动主函数main和其他函数中的任何内容,仅在 main函数的横线上填入所编写的若干表达式或语句。
试题程序:
#include <stdio.h>
#include <conio.h>
#include <math.h>
main()

float a,b,c,disc,x1,x2,p,q;
scanf("%f,%f,%f",&a,&b,&c);
disc=b*b-4*a*c;
clrscr();
printf("****** the result ****+*+\n");
if(disc>=0)

x1= 【1】
x2=(-b-sqrt(disc))/(2*a);
printf("x1=%6.2f,x2=%6.2f\n",x1,x2);

else

p= 【2】
q= 【3】
printf("x1=%6.2f+%6.2f i\n",p,q);
printf("x2=%6.2f-%6.2f i\n",p,q);

题型:单项选择题

《水经注》的作者是()朝的()

题型:单项选择题

()的行为属于恐怖主义行为。

A、以无辜者作为目标,用非正常的暴力手段或以暴力相威胁

B、伤害无辜者的生命,造成恐怖效果,以达到某种政治或社会要求

C、袭击军事目标

D、A+B+C

题型:单项选择题

关于治导线的正确论述包括()。

A.整治后通过设计流量时的平面轮廓

B.由曲线段和直线段间隔组成

C.是堤轴线

D.曲线段一般为复合圆弧曲线或余弦曲线

E.弯道顶处半径最小

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