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

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
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阅读下面短文,根据所读内容在文后小题的空格里填上适当的单词或短语。 注意:每空不超过3个单词。
Colors can affect our feelings. Generally, they can be divided into four kinds. They are calm colors, warm colors, energetic colors and strong colors.
Calm colors  Some colors make us feel calm and peaceful. Blue is one of those colors. Blue can also represent sadness, so you may say “I’m feeling blue” when you are feeling sad. White is another calm color. It makes you feel calm and peaceful.
Warm colors  Some colors can give you a happy and satisfied feeling. Colors like orange or yellow belong to these. Orange represent joy. It can bring you success and cheer you up when you’re feeling sad. Yellow is the color of the sun and wisdom, too.
Energetic colors  When you feel tired or weak, you should wear energetic colors, such as green. Green can give you energy as it is the color of nature and stand for new life and growth.
Strong colors   Anyone who needs physical or mental strength should wear red clothes. Red is the color of heat and represent power and strong feelings.
Colors and feelings
小题1:__________of colors
feelings
examples
calm colors
Calm and peaceful
小题2:__________
white
warm colors
小题3:__________
orange
yellow
energetic colors
energetic
小题4:__________
strong colors
小题5:__________
red
 
 
 
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男性,62岁,患冠心病多年,于情绪激动后出现胸骨后剧烈疼痛,服硝酸甘油后不能缓解,并伴有全身软弱、大汗淋漓、四肢冰凉。

最可能的诊断是()

A.胆石症

B.急性胰腺炎

C.急性心肌梗死

D.低血糖

E.低血钾

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治理黄土高原的水土流失首先要 

A.加固黄河大提

B.跨流域调水

C.制止滥垦土地

D.修建水库

题型:选择题

可建范围面积为( )m2

A.930

B.900

C.887

D.800

题型:选择题

FDG代谢可能较低的肝脏病变是()。

A.高分化肝细胞肝癌

B.中、低分化肝细胞肝癌

C.肝脏腺癌

D.肝脏转移癌

E.肝脏淋巴瘤

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