具有铁芯的线圈电阻为R，加直流电压U时，线圈中通过的电流I为何值？若铁芯有气隙，当气

发布时间：2017-11-21 12:57 │ 来源：www.tikuol.com

题型：问答题简答题

问题：

具有铁芯的线圈电阻为R，加直流电压U时，线圈中通过的电流I为何值？若铁芯有气隙，当气隙增大时电流和磁通哪个改变？为什么？若线圈加的是交流电压，当气隙增大时，线圈中电流和磁路中磁通又是哪个变化？为什么？

考点：电子与通信技术电子电路电子电路题库

题型：问答题简答题

下列各组词语中，加点字的注音全都正确的一组是

A．箪食壶浆(shí)　　饮食起居(shí)　　斗转参横(shēn)　　参差不齐(cēn)

B．量体裁衣(liánɡ)仔细打量(liɑng)臧否人物(zānɡ)藏传佛教(zànɡ)

C．螳臂当车(dāng)安步当车(dàng)大腹便便(pián)便宜行事(biàn)

D．兵不血刃(xuè)鲜血淋漓(xiě)泥牛入海(ní)泥古不化(nì)

查看答案

题型：问答题简答题

Every school has notice boards. Let’s see what is on the notice board of an American school.

School Rules Fighting, saying bad words and all other bad behavior will not be allowed. Do not throw rocks, snowballs or sticks on the school grounds. Hand in a note or telephone to school if your child will be absent for the day. Parents and visitors need to check in at the office when entering the school.		Report Card Report card about your school life and work will be given to your parents. Look at the marking key for your school work. MARKING KEY(评分标准) ●Goes beyond grade level standards 4 ●Meets grade level standards 3 ●Does not meet grade level standards, but Making progress 2 ●Does not meet grade level standards 1
	Class Announcement(通知) Testing Dates: The math test is on June 12～13. The science test is on June 15 Parents Meeting: The next parents meeting is at 7:00pm on Friday, June 22 in the meeting hall. Homework: Please check the Homework Board at the school homepage to find your homework.		After-school Program The after-school programs will continue for the year 2013. The programs will be open from 3:30 to 6:00pm every day. 3:30～4:30 Homework＆ Reading 4:30～6:00 Activities If you have any questions, feel free to call the school at 524-9752

小题1:According to School Rules, visitors have to _________ when entering the school.

A．hand in a note	B．call at 524-9752
C．check in at the office	D．telephone to the school

小题2:From _________, parents can get information on the parents meeting

A．School Rules	B．Report Card
C．After- school Program	D．Class Announcement

小题3: Report Card shows parents_____________.

A．certain school rules	B．after-school activities
C．plans for classes and tests	D．children’s school life and work

小题4:Suppose Tony doesn’t do well at school but makes progresses, he will get_____ on the Report Card

小题5:Students do their homework and read books___________.

A．from 3:30 to 4:30	B．from 3:30 to 6:00
C．from 4:30 to 6:00	D．from 6:00 to 7:00

查看答案

题型：问答题简答题

下列几项中，哪一项是影响内部沟通效果的因素的主观因素（）。

A.双方在经验水平和知识结构上差距过大

B.沟通双方如果在空间上相距太远

C.社会和文化背景的差异、种族差异

D.机构过于庞大、中间层次太多

查看答案

题型：问答题简答题

读“合肥市人口自然变动阶段差异示意图”，回答下列各题。

小题1:下列各阶段中，人口总增长最多的是

A．1949~1952年

B．1958~1963年

C．1964~1976年

D．1986~1990年小题2:有关合肥市各阶段人口变动的正确叙述是

A．1949~1952年属于低增长现代型人口增长模式

B．1953~1957年自然增长率和自然增长人数均最高

C．1958~1963年经济快速发展，人口迁入增长较大

D．1986~1990年受60年代人口高峰影响生育率较高

查看答案

题型：问答题简答题

分裂样人格障碍

查看答案

更多题库