如图所示，矩形线圈有N匝，长为a，宽为b，每匝线圈电阻为R，从磁感应强度为B的匀

发布时间：2017-07-21 02:04 │ 来源：www.tikuol.com

题型：选择题

问题：

如图所示，矩形线圈有N匝，长为a，宽为b，每匝线圈电阻为R，从磁感应强度为B的匀强磁场中以速度v匀速拉出来，那么，产生的感应电动势和流经线圈中的感应电流的大小应为（　　）

A．E=Bav，

B．E=NBav，

C．E=Bav，

D．E=NBav，

考点：导体切割磁感线时的感应电动势闭合电路欧姆定律

题型：选择题

男性，59岁。急性弥漫性腹膜炎观察2小时后病情无缓解，腹胀加重，但病因仍难以确定。根据患者情况，目前的治疗措施中，不宜采取的是（）。

A.立即进行剖腹探查

B.纠正水电解质、酸碱代谢失调

C.禁食、胃肠减压、补充能量、营养支持

D.应用广谱抗生素

E.通过辅助检查手段尽可能明确病因

查看答案

题型：选择题

完形填空。
Some personal characteristics play an important role in the development of one's intelligence. But people fail to realize the importance of training these factors in young people. The so-called 'non-intelligence factors' include 1 feelings, will, motivation, interests and habits. After a 30-year follow-up study of 8000 males, American psychologists (心理学家) 2 that the main cause of disparities (不同) in intelligence is not intelligence 3 , but non-intelligence factors including the desire to learn, will power and self-confidence. 4 people all know that one should have definite objectives , a strong will and good learning habits, quite a number of teachers and parents don't pay much attention to 5 these factors. Some parents are greatly worried 6 their children fail to do well in their studies. They blame either genetic factors, malnutrition (营养不良), or laziness, but they never take 7 consideration these non-intelligence factors . At the same time, some teachers don't inquire into these, such as reasons 8 students do poorly. They simply give them more courses and exercises, or 9 criticize or laugh at them. After all, these students lose self-confidence. Some of them just feel defeated and 10 themselves up as hopeless. Others may go astray (迷途) because they are sick of learning. 11 investigation of more than 1,000 middle school students in Shanghai showed that 46.5 per cent of them were 12 of learning, because of examinations. 36.4 per cent lacked persistence, initiative (主动) and consciousness (知觉) and 10.3 per cent were sick of learning. It is clear 13 the lack of cultivation (培养) of non-intelligence factors has been a main 14 to intelligence development in teenagers. It even causes an imbalance between physiological (生理的)and 15 development among a few students. If we don't start now to 16 the cultivation of non-intelligence factors , it will not only affect the development of the 17 of teenagers , but also affect the quality of a whole generation . Some experts have put forward 18 about how to cultivate students' non-intelligence factors. First, parents and teachers should 19 understand teenage psychology. On this basis, they can help them to pursue the objectives of learning, 20 their interests and toughening their willpower.
( )1. A.one's ( )2. A.came out ( )3. A.in itself ( )4. A.Though ( )5. A.believing ( )6. A.about ( )7. A.for ( )8. A.why ( )9. A.ever ( )10. A.put ( )11. A.The ( )12. A.afraid ( )13. A.that ( )14. A.difficulty ( )15. A.intelligent ( )16. A.practice ( )17. A.intelligence ( )18. A.projects ( )19. A.fully ( )20. A.insuring	B. their B. found out B. by itself B. Nevertheless B. studying B. when B. in B. that B. even B. get B. An B. ahead B. how B. question B. characteristic B. threat B. diligence B. warnings B. greatly B. going	C. his C. made out C. itself C. However C. cultivating C. how C. into C. when C. still C. handle C. Another C. aware C. why C. threat C. psychological C. strengthen C. maturity(成熟) C. suggestions C. very C. encouraging	D. her D. worked out D. on its own D. Moreover D. developing D. whether D. over D. how D. more D. give D. A D. ashamed D. which D. obstacle D. physical D. urge D. performance D. decision D. highly D. exciting

查看答案

题型：选择题

空气制动机灵敏度是指活塞得动作压差，如103型及104型分配阀得灵敏度为不超（），活塞即将移动。

A.20kPa／cm

B.40kPa／cm

C.50kPa／cm

D.7kPa／cm

查看答案

题型：选择题

包含重要的国家机密，泄露会使国家的安全与利益遭受到严重损害的文件属于( )。

A．秘密文件

B．绝密文件

C．机密文件

D．保密文件

查看答案

题型：选择题

对（）的优化就是要协调版面整体与部分的关系。

A.模块排版

B.视觉平衡

C.视觉中心

D.视觉整体

查看答案

更多题库