首页 / 由同种材料制成的三根电阻丝，已知它们的长度关系L1＞L2＝L3，横截

由同种材料制成的三根电阻丝，已知它们的长度关系L1＞L2＝L3，横截

由同种材料制成的三根电阻丝，已知它们的长度关系L1＞L2＝L3，横截面积的关系为S1=S2＜S3,现将它们串联接入电路，关于它们的电阻和通过他们的电流，正确的是:

A．R1＜R2=R3 ，I1=I2=I3   ;              B．R1＝R2＞R3， I1=I2＞I3     ;

C．R1＞R2＞R3，I1＞I2＞I3  ;          D．R1＞R2＞R3，  I1=I2=I3.

答案

D

相关题目

In 1841, a book was published which astonished the world. It was called“Incide
In 1841, a book was published which astonished the world. It was called“Incidents of Travel in Central America, Chiapas and Yucatan”. The author John Loud Stephens had just returned from a long, d
I like these English songs and they           many times on the radio.
I like these English songs and they           many times on the radio. A.taught             B.have taught      C.are taught      D.have been taught  
在一个生态系统中，A种群有N个个体，B种群有100N个个体，C种
在一个生态系统中，A种群有N个个体，B种群有100N个个体，C种群有1000N个个体，D种群有10000N个个体，则它们的食物链关系是             （  ）  
已知数列的前项和为． （Ⅰ）求数列的通项公式；    （Ⅱ
已知数列的前项和为． （Ⅰ）求数列的通项公式；    （Ⅱ）若,求的值.
   You probably know you should say please and thank you at restaurants. You
   You probably know you should say please and thank you at restaurants. You probably know the rules of a library. You know you should respect and be nice to your classmates. But do you have musi
   The iPhone, the iPad: each of Apple’s products sounds cool and has becom
   The iPhone, the iPad: each of Apple’s products sounds cool and has become a fad(一时的风尚). Apple has cleverly taken advantage of the power of the letter “i” –-- and many other b
We ______ for a picnic if it ______ rain this Sunday.A. go; doesn’t      
We ______ for a picnic if it ______ rain this Sunday.A. go; doesn’t             B. will go; won’t C. will go; doesn’t      D. go; won’t
随着物质生活水平的逐步提高,人们的精神需求也不断提高。
随着物质生活水平的逐步提高,人们的精神需求也不断提高。人们在闲暇之余，进行观光旅游，网上冲浪，穿衣讲“服饰文化”，吃饭讲“饮食文化”，

最新题目

吸气时，肺容积和气压变化的情况是(  )A．肺容积增大，气
同学们用高锰酸钾制氧气．制取结束清洗仪器．发现加热高
（20分）如图甲所示，空间存在B=0.5T，方向竖直向下的匀强磁
 I’ve acquired (获得) ______ knowledge from this reference book.   A.much
用起重机将质量为m的物体匀速的吊起一段距离，那么作用在
家庭生活中处处都有物质变化，下列发生在家庭生活中的变
北京市首家由外资银行控股的村镇银行——密云汇丰村镇银
– Let’s go to the supermarket by taxi. -- We ______ take a taxi. It’s not
One day, while my friend and I was traveling through              
   Last year, A Bite of China, made by CCTVs Documentary Channel, sparked dis
甲、乙两个灯泡分别标有“220V，40W”、“220V，100W”字样，
．如图，直径AB和弦CD相交于点E，已知AE＝1 cm，EB＝5 cm，∠DEB
以下地理现象中，不是由于地球自转产生的是          
“低碳生活”是指减少能源消耗、节约资源，从而降低二氧
生活中的物质多种多样，下列分别盛有不同物质的容器中，
图表归纳法是历史学习的方法之一。下表反映了中国近现代
要比较准确的测量出京珠高速公路的里程，比较科学而简单
从历史发展的过程看，下列判断正确的是 A.一切商品都能承
已知下列反应可以制得苯乙烯： 写出以氯气、乙炔、氢气、
7.美国研究人员发现了一个有趣的现象，肥胖可能与大脑中多