下面关于硬盘存储器结构与组成的叙述中，错误的是（）。 A.硬盘由磁盘盘片、主轴与主轴

根据短文内容，选择正确答案。

     We have twenty minutes' rest between classes. Look! Most of us are playing during the break time.

  Some students are on the playground. They are playing basketball. Oh! A boy is running with the ball.

 And another is trying to stop him. They look so cool. And there are some girls watching the game. Some

 students are in the classroom, They are talking. A few of them are reading and doing homework. Look!

  A girl is looking at the birds in the tree in front of the classroom. She must be thinking of something

 interesting because she is smiling (微笑) .

     What are the teachers doing? Some of them are working in the office. And some are talking with

 students. Everyone is doing his or her things, busy but happy !

l. Where are the students playing basketball?

    A. In front of the tree.

    B.  In front of the classroom.

    C. On the playground.

    D. In the tree.

2.  A girl is looking at the birds.  She is _____.    

     A. happy

     B. cool

     C. interesting

     D. exciting

3. What are the teachers doing?

    A. Working or talking with students.

    B. Having a basketball game.

    C. Playing with the students.

    D. Looking at the birds.

4. There are _____ students in the classroom.

    A. no          

    B. some

    C. few        

    D. many

5. The passage is mainly(主要) about _____.

    A. students

    B. a basketball game

    C. break time activities

    D. teachers

农业推广中，每项创新在农业中的应用呈现明显的周期性，从创新的引进到典型示范，称为（）

A.试验示范期

B.发展期

C.成熟期

D.衰减期

在标准溶液的配制与标定时所用的水，如果没有注明其它要求，应符合GB6682中（）的规格。

A、蒸馏水

B、三级水

C、自来水

D、A、B、C都行

请补充函数fun()，该函数的功能是判断一个数是否为素数。该数是素数时，函数返回字符串：yes!，否则函数返回字符串：no!，并在主函数中输出。 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，仅在函数fun()的横线上填入所编写的若干表达式或语句。 试题程序： #include "conio.h" #include "stdio.h" 【1】 { int i, m; m=1; for(i= 【2】 ;i＜n; i++) if ( 【3】 ) { m=0; break; } if(m==1&&n＞1) return("yes!"); else return("no!"); } main() { int k=0; clrscr(); printf("Input:"); scanf("%d",&k); printf("%s\n",fun(k)); }

放喷管线出口固定有什么标准？固定的基墩距离放喷管线出口不大于多少米？