地球是个大磁体,在赤道上,地磁场可以看成是沿南北方向的匀强磁场.如果赤道某处的磁

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问题:

地球是个大磁体,在赤道上,地磁场可以看成是沿南北方向的匀强磁场.如果赤道某处的磁感应强度大小为0.5×10-4T,在赤道上有一根东西方向的直导线,长为20m,通有从东到西30A的电流,则求:

(1)地磁场对这根导线的作用力有多大?方向如何?

(2)通电直导线如果南北方向放置,则地磁场对这根导线的作用力有多大?

考点:磁场对通电导线的作用:安培力、左手定则
题型:问答题

人口质量

题型:问答题

在项目前期各阶段的各项工作中,初步可行性研究的投资估算精度要求为( )。

A.±10%

B.±20%

C.±30%

D.±40%

题型:问答题

关节造影常见部位是

A.膝关节
B.髋关节
C.肘关节
D.肩关节
E.腕关节

题型:问答题

阅读理解。

     About a year ago, I went to stay at a Detroit hotel. I didn't want to carry too much money with me, so I

asked the desk clerk to put a hundred- dollar bill in the safe for me.

     The next morning, however, the clerk said he knew nothing about my money. I didn't have any proof (证

据) that I had given the man the money. There was nothing I could do but go to the nearest lawyer.

     The lawyer advised me to return to the hotel with him and give another hundred-dollar bill to the clerk.

This I did. An hour later, I went back to the desk and asked for my money. Because I had the lawyer as an

eyewitness to the second hundred-dollar bill, the clerk could not say he knew nothing about it.

     Another hour later, I put the second part of the lawyer's plan into action. This time both the lawyer and I

went to the hotel. I asked for the hundred-dollar bill once again, and when the clerk insisted he had already

given it to me, I denied (否认) it. The lawyer said to him, "I saw this gentleman give you a hundred dollars.

If you don't return it immediately, I'll be forced to call the police."

     The clerk realized he had been tricked, so he gave me back the first hundred-dollar bill.

     "I don't know how to thank you enough for getting my money back," I said to the lawyer. And what you

suppose he answered? He said, "Oh, don't thank me. That will be a hundred dollars, please."

1. The man went to a Detroit hotel one day to _____. [ ]

A. get his money back

B. put a hundred-dollar bill in the safe

C. ask to be a desk clerk

D. stay for the night

2. The hotel clerk at last returned the first hundred-dollar bill to the man because _____.[ ]

A. he knew the lawyer's plan very well

B. he found the lawyer tricking him

C. he didn't want to get into trouble with the police

D. he wanted to give the man a surprise

3. It is clear that the hotel clerk was _____. [ ]

A. dishonest

B. ready to help

C. afraid of the lawyer

D. foolish

4. Which of the following statements is TRUE? [ ]

A. The man didn't get his 200 dollars back.

B. The lawyer was happy that the man got both his bills back.

C. The lawyer asked for 100 dollars.

D. The man thanked the lawyer by paying him some money actively (主动地).

5. How do you think the man felt in the end? [ ]

A. Pleased.

B. Thankful.

C. Happy.

D. Sad.

题型:问答题


[背景材料]
原告:某省B建筑公司。
被告:某省A房地产公司。
2000年11月22日某省A房地产公司就一住宅建设项目进行公开招标,该省B建筑公司与其他3家建筑公司共同参加了投标。结果由B建筑公司中标。2000年12月14日,A房地产公司就该项工程建设向B建筑公司发出中标通知书,其中载明:工程建筑面积为74781m2,中标价格人民币8000万元,要求于12月25日签订工程承包合同,12月28日开工。
中标通知书发出后,B建筑公司按A房地产公司的要求提出,为抓紧工期,应该先做好施工准备,后签工程合同。A房地产公司也就同意了这个意见。之后,B建筑公司进入了施工现场,平整了场地,将打桩桩架运入现场,并配合A房地产公司在12月28日打了2根桩,完成了项目的开工仪式。
但是,工程开工后,还没有等到正式签订承包合同,双方就因为对合同内容的意见不一而发生了争议。A房地产公司要求B建筑公司将工程中的一个专项工程分包给自己信赖的C公司,而B建筑公司以招标文件没有要求必须分包而拒绝。2001年3月1日,A房地产公司明确函告B建筑公司:将另行落实施工队伍。
B建筑公司诉至工程所在地中级人民法院。在法庭上B建筑公司指出,A房地产公司既已发出中标通知书,就表明招投标过程中的要约已经承诺,按招投标文件和《建设工程施工合同(示范文本)》的有关规定,签订工程承包合同是A房地产公司的法定义务。因此,B建筑公司要求A房地产公司继续履行合同,并赔偿损失560万元。但A房地产公司辩称:虽然已发了中标通知书,但这个文件并无合同效力,且双方的合同尚未签订,因此双方还不存在合同上的权利义务关系,A房地产公司有权另行确定合同相对人。
[问题]

由于没有订立合同,双方都有一定损失,双方的损失应当如何承担,为什么

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