如图所示为在实验室中做实验时所用的一电路示意图,电源总电压不变,闭合开关,当滑片

题型:选择题

问题:

如图所示为在实验室中做实验时所用的一电路示意图,电源总电压不变,闭合开关,当滑片P向A端移动时,下列说法中不正确的是(  )

A.电路中消耗的总功率变小

B.灯L的亮度将变暗,两端的电压变小

C.电路中总电阻变大,总电流变小

D.变阻器的电阻变大,通过的电流变大

考点:欧姆定律及其应用滑动变阻器
题型:选择题

一般而言,制单的程序足( )。

A.先缮制汇票,然后按汇票内容分别缮制其他单证

B.先缮制发票,然后按发票内容分别缮制其他单证

C.先缮制装箱单,然后按装箱单内容分别缮制其他单证

D.先缮制提单,然后按提单内容分别缮制其他单证

题型:选择题

若一理想变压器的副边电压U2=20V,原边绕组匝数N1=2000,副边绕组匝数N2=100,流过原边的电流I1=2A,则原边电压U1和副边电流I2应为()。

A.400V2A

B.200V40A

C.400V40A

D.200V2A

题型:选择题

I woke up this morning. There is an empty feeling that I have had so many times before and it seems to be coming back into my mind. What is it? I can’t figure it out.

I got ready for work. On the way I decide to stop and get a cheese from the little shop just down the road. I have never been there before but I was hungry and it would be 5 hours before I got off work.

The owner of the store took my order. He asked me what I wanted and I told him I heard he made a great cheese. He seemed pleased to hear that.

As I was sitting in the small space,there was an elderly gentleman finishing his breakfast. He paid the waitress, received this change and made a small joke. As he turned to get up, which was quite a difficult feat for this gentleman, he looked over at me. I gave a small smile.

He looked again in my direction for a moment and said to me, “Has anyone ever told you, you have the most beautiful brown eyes?”

Seeing as I have blue eyes, I can’t say I have ever heard that before. I humored him and said, “No, I can’t say anyone has ever told me that before.”

He smiled, and said,“Well since they are blue you wouldn’t have heard that, but you have beautiful blue eyes.”

I laughed and said thank you very much. He began to tell me a few one liner jokes so I smiled and laughed at his jokes.

He tried to get up to leave again and looked at me and said“Your smile really brightens a room, do you know that?”I said,“Thank you very much.”

He proceeded to get up, which took him quite some time. As he got up he said,“Take care of that smile.”

I felt a sense of comfort wash over me and I reflected on my morning and that empty feeling I had. For a moment in time it seemed to be filled.

小题1:Before the writer went to work, he felt________.

A.sleepy

B.energetic

C.sick

D.unhappy小题2:From the text, we can infer the old man __________.

A.was optimistic about life

B.liked to play a joke on others

C.was unwilling to leave

D.had difficulty in hearing小题3:By saying“since they are blue”, the old man meant“_____________”.

A.because they feel cold

B.because they are sad

C.because they have blue eyes

D.because they are hungry小题4:What lesson can we learn from the story?

A.We should find comfort from stranger.

B.We should pay attention to our own business.

C.We should laugh off our worries in life

D.We should show respect to the old people.

题型:选择题

微观投资环境

题型:选择题

属于超短波的是()。

A、波长7.37m频率40.68MHz

B、波长6.00m

C、波长69cn频率433.92MHz

D、波长2.24m频率2450NHz

E、波长8mm频率37.56Hz

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