某发光点S所发出的两条光线经平面镜反射后形成的光线如图所示,请完成光路图并确定发

题型:问答题

问题:

某发光点S所发出的两条光线经平面镜反射后形成的光线如图所示,请完成光路图并确定发光点S的位置.

考点:光的反射的光路图平面镜成像的相关作图
题型:问答题

根据图片及对话内容排序。

A. Now pick up the scissors. Hold the paper carefully and cut through it. Keep the small piece of string

    between you and the scissors, so you do not cut the string.

B. "Magic string" is a popular magic trick. You can do this trick for your friends or family. You just need

    a piece of paper, a piece of string and some scissors. That's all.

C. Pick up the paper and fold side A down. Now your friends can see side B, but they can't see side A.

    Side A is shorter than B, so it does not cover the string. Push the middle of the string up, and fold C

    up over A. Now most of the string is inside the paper, but a small piece of the string is outside. You can

    see it but your friends can't.

D. Put one hand over the paper, and then pull the string out slowly with your other hand. The string is still

     in one long piece!

E. First, fold the paper so that it is like the paper in the picture. Side A is shorter than side B, but not much

    shorter. Side C is much shorter than Side B. Show the long piece of string so that people can look at it.

     Put this piece of string on the paper.

1._____2_____3._____4._____5._____

题型:问答题

某开发公司欲进行写字楼的开发建设,在对区域总体写字楼市场进行调查研究的基础上,决定将项目放在竞争不是特别激烈的A区,A区虽然不是黄金闹市区,但处在成长中的小型民营企业众多,了解到这些企业希望通过拥有自己的物业来减轻租金的负担,该开发公司于是将物业定位为实用型出售型写字楼,面积为100~150m之间,总价100万元起。但是项目推出以后,销售情况并不乐观。针对以上现象,试分析下列各题。

房地产市场调查的一般内容应涉及()。

A.供给调查

B.需求调查

C.价格调查

D.产品调查

题型:问答题

在世界资产阶级革命史上,诞生了一系列影响人类历史进程的重要法律文件。请你根据下列介绍写出对应的文件名称。

(1)标志着美国的诞生——  

(2)标志着君主立宪制的资产阶级统治开始确立——  

(3)法国大革命时期提出了在权利方面人们生来是而且始终是自由平等的是——  

(4)标志着三权分立的资产阶级政治体制开始确立——  

题型:问答题

以下各选项中能正确声明一个表示50个值为null的字符串数组的是( )。

A.string[]a;

B.string a[];

C.chara[50][]

D.stringa[]=newString[50]

题型:问答题

适用于皮肉浅薄部位腧穴的进针方法是()

A.指切进针法

B.舒张进针法

C.夹持进针法

D.提捏进针法

E.单手进针法

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