如图所示的区域内有垂直于纸面的匀强磁场,磁感应强度为B。电阻为R、半径为L、圆心

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问题:

如图所示的区域内有垂直于纸面的匀强磁场,磁感应强度为B。电阻为R、半径为L、圆心角为45°的扇形闭合导线框绕垂直于纸面的O轴以角速度ω匀速转动(O轴位于磁场边界)。则线框内产生的感应电流的有效值为

[ ]

A.

B.

C.

D.

考点:感应电动势感应电流
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完成短文

It ___1___Tuesday. At 8:00 he ____2____( not have ) math. He ___3____(have) Chinese. Then at 9:00 he has science. It’s difficult, ___4___ interesting. Next at 10:00 he has history. It’s boring. But at 11:00 he has P.E. That’s __ _5___ favorite subject. He ___6____ lunch at 12:00. After lunch, He has music, it’s

relaxing. He _  _7___ his music teacher, Mr. Morgan. He’s fun. All his classes __  _8____ at 2:00. After class he has gymnastics ____9_____ two hours. His teacher is very ___10____, and he ___11____ him very tired. But after that, he has Chinese history club. It’s ___12___ interesting.

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下图反映了

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A、世界经济呈现全球化趋势

B、世界政治格局出现多极化趋势

C、意大利的经济生产总值超过德国

D、世界各国经济发展水平差距大

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在医疗过程中,医生的医疗权应该( )

A.服从医院的发展
B.服从病人的权利
C.服从社会公益
D.服从医院行政领导
E.服从家属的意愿

题型:不定项选择

中国第一个举办亚运会的城市是()

A.上海

B.北京

C.天津

D.广州

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下列关于全面预算管理优点中沟通和协调方面说法正确的是()。

A.通过预算的编制,管理者与员工相互沟通以达成共识

B.部门与部门之间相互协调以合理配置资源、安排生产

C.减少了预算未来执行的障碍

D.对预算管理起不到良好作用

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