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如图所示,在磁感应强度为B的匀强磁场中有两条平行金属导轨,导轨间的距离为l,导轨上连有电阻R和电容C.磁场方向垂直于导轨平面。图中AB为放置在金属导轨上的导体杆,电阻为r。导体杆AB在拉力的作用下匀速向右运动,速度为v,不计导轨的电阻以及导体杆AB与导轨之间的摩擦。求:
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【考情点拨】本题考查了法拉第电磁感应定律、欧姆定律、功及功率的概念的知识点。
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当斜面的倾角为a时,斜面上的物体恰好从斜面上匀速滑下.该物体与斜面之间的动摩擦因数μ等于(??)
如图所示,在正的点电荷Q产生的电场中的一根电场线上有A、B两点.现在把质量为m1、m2,电荷量为q1、q2的两种带电粒子先后放在A点,使它们由静止开始运动并经过B点.已知m2=4m1,q2=-2q1,两种粒子经过B点时速率之比υ1:υ2等于(??)
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用伏安法测电阻,按图中甲图测得的结果为R1,按乙图测得为R2,若电阻的真实值为R,则以上三量的正确关系应为__________(用“>”或“<”表示)。
A、B、C均为短周期元素,它们在周期表中的位置如图所示:已知B、C两元素原子序数之和为A元素原子序数的4倍,则A、B、C依次是(??)
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1.
21. There is no doubt that new technologies will also play an important role in language teaching in the twenty-first century. Indeed, the use of technology in foreign language learning has constituted another important revolutionary movement in our discipline (学科)in the last half of the twentieth century. Although it has clearly not been a methodological revolution,technological innovation has played an important role in the recent history of language teaching and is bound to have a profound effect on the way that languages are taught in the future. Beginning with the introduction of filmstrips, audiotapes, and language labs in “direct method” and “audiolingual” classroom over forty years ago, technological innovation has moved from the increased use of cassette tapes, videotapes, and overhead projectors and cameras in the past several decades to the introduction of CD-ROMs and the Internet in the 1990s. The possibilities for computer-enhanced language teaching have most recently been explored in distance education programs as well as in the use of local area networks, computer-assisted reading programs, and web-based classroom activities.Though the use of technology is nothing new in foreign language teaching, its exact role in the curriculum is still being assessed and questioned, particularly in light of the rapidly changing nature of technological aids to instruction. Rather than seeing technology as just another ancillary (助手) to be added to our teaching devices, we need to evaluate its potential for enhancing classroom learning as well as for facilitating (使……便利)student-centered, independent learning outside the classroom. In using technological aids and computer-mediated (计算机为中介的)materials in instruction, we also need to bear in mind the level of proficiency of our students and their ability to benefit from the materials that can be used for them. The use of authentic materials is going to be discussed in more detail in a later section of this chapter and in subsequent chapters.(10分)21.1 This passage is mainly about____.(2分)A. the role technology plays in foreign language learningB. the role technology plays in foreign language teachingC. the role computer plays in language learning and language teachingD. the role technology plays in foreign language learning and teaching
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如图,两个同心得均匀带电球面,内球面带电荷Q1,外球面带电荷Q2,则在两球面之间、距离球心O为r得P点出(OP=r)的电场强度大小E为
3.
资本全球化的基础是( )
4.
14.1938 年 3 月,国民党军队在抗日战争正面战场取得胜利的战役是
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(本题共有10个关键点,均已用数字标出,请将答案填写在题后相应的标号处)完成一个名为Score的程序,输入为5个学生信息,每个学生有3门课的成绩,从键盘输入数据(包括学生号、姓名、成绩),计算出平均成绩,并将原有的数据和计算出的平均分数输出到磁盘文件"studScore"中。使用Eclipse CDT实现该C程序,完成从新建项目、源文件夹,编写代码并终编译运行一系列步骤,补充上述这些步骤中的关键点。(1)新建项目:打开 ① 集成开发环境,点击菜单栏上的“File”菜单,选择新建子菜单下的C Project选项,弹出选择向导窗口。在对话框中打开C/C++文件夹,选择“C Project”后点击“Next’’进入下一步。在项目名称栏中输入“Score”,并在项目类型“Projecttype”标签中打开“ ② ”文件夹,选择“Empty Project”,点击“Finish”按钮完成。(2)新建源文件夹:鼠标右键点击③ 中的新建的项目,在弹出的菜单中,选择“New”子菜单里的源文件夹“Source Folder”选项。在弹出的窗口中需要输入文件夹名称,把光标定位到“Folder Name”栏中输入源文件夹名称“src”,然后点击“ ④ ”按钮完成。(3)新建C类文件:参照前一个步骤新建的源文件夹,在资源管理器中鼠标右键点击src文件夹,在弹出的菜单中选择 ⑤ 子菜单里的类“Class”选项,新建一个名为“Score”的类文件。(4)编写C程序代码:打开第3步中建好的Score文件,在编辑器中编写代码如下,补充代码中的关键步骤。#include"stdio.h"#include"stdlib.h"struct student{char num[6];char name[8];int score[3];float avr;}stu[ ⑥ ];int main(void){int i,j,sum;FILEfp;for(i=0;i<5;i++){printf("\n请输入第%d个学生的成绩:\n",i);printf("学号:");scanf("%s",stu[i].num);printf("姓名:");scanf("%s",stu[i].name);sum=0;for(j=0;j<3;( ⑦ ){printf("第%d门课程成绩:",j+1);scanf("%d",&stu[i].score[j]);sum +=stu[i].score[j];}stu[i].avr=sum/3.0;}fp=fopen("studSeore"," ⑧ ");for(i=0;i<5;i++)if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1)printf("文件写入错误。\n");fclose( ⑨ );return EXIT_SUCCESS;}(5)运行C程序:在资源管理器中鼠标右键点击该项目,在 ⑩ 子菜单中选择运行设置“tRun Configurations”,在“Project”'栏中输入项目名称Score,或者点击“Browse”按钮,在弹出的对话框中选择相应的项目。在“C/C++ Application”栏中点击“Search Project”按钮,选择相应的程序来运行。①______。②______。③______。④______。⑤______。⑥______。⑦______。⑧______。⑨______。⑩______。
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