运输需求具有哪些特性？

一个长方形长为6cm，宽为2cm，以其中一边为轴旋转得到一个圆柱，请问以哪条边为轴得到的圆柱侧面积大？以哪条边为轴得到的圆柱体积大？

强心苷治疗心力衰竭的药理学基础是()

A．抑制房室传导

B．加强心肌收缩力

C．抑制窦房结

D．缩短心房的有效不应期

E．加快房室传导

阅读理解

     Homebuyers nationwide are watching housing prices going up, up, and up. "How high can they go?"

Is the question on everyone's lips. "As long as interest rates stay around 5 percent, nothing might be able

to prevent housing prices going up," said one house seller in Santa Monica, California.

     "It's crazy," said Tim, who is looking for a house near the beach. "In 1993, I bought my first place,

a two－bedroom flat in Venice, for$70,000. My friends thought then that I was overpaying. Five years

later, I had to move. I sold it for $ 230,000, which was a nice profit. Last year, while visiting friends

here, I saw in the local paper that the exact same flat was for sale for $ 510,000!"

     It is a seller's market. Homebuyers feel like they have to offer at least 10 percent more than the

asking price. Donna, a new owner of a one－bedroom flat on Venice Beach, said, "That's what I did.

I told the owner that whatever anyone offers you, I'll give you $ 20,000 more under the table, so you

don't have to pay your house seller any of it. I was tired of negotiating with the house sellers."

     Tim says he hopes he doesn't get that desperate. "Whether you decide to buy or not, you still feel

like you made the wrong decision. If you buy, you feel like you overpaid. If you don't buy, you want to

kick yourself for passing up a great opportunity."

     Everyone says the bubble(气泡)has to burst sometime, but everyone hopes it will burst the day after

they sell their house. Even government officials have no idea what the future will bring. "All we can say is

that, clearly, these things go in regular cycles," said the state director of housing. "What goes up must

come down. But, as we all know, housing prices always stay up a little higher than they go down

(被接受). So you can't lose over the long run. Twenty years down the road, your house is always

worth more than you paid for it."

1. If Tim had sold his flat last year, he could have earned __________.

A. $ 510,000      

B. $ 440,000

C. $ 280,000  

D. $ 160,000

2. Donna paid another $ 20,000 to the owner secretly because __________.

A. she felt like offering 10% more

B. secret money made low price

C. the owner asked for the money

D. she was bored with bargaining

3. We can infer from Tim's words in Paragraph 4 that __________.

A. homebuyers feel hesitate facing rising house prices

B. buying a house is always a great opportunity

C. homebuyers never make the right decision

D. both sellers and buyers become desperate

4. Which of the following is TRUE about the housing bubble?

A. It is something everyone hates to see.

B. Only experts know when it will burst.

C. It is unavoidable in the regular circles.

D. It usually stays for about twenty years.

常见的局域网主要有（）、令牌环网、FDDI（光纤分布式数据接口）网络等。

患者男性，32岁。体检发现HBsAg阳性十余年，近2周来感乏力，食欲不振，近1周来出现皮肤发黄。查体：精神萎靡，皮肤、巩膜深度黄染，腹部膨隆，肝脾未扪及，腹水征阳性。化验：HBsAg(+)，ALT380U/L，白蛋白30g/L，球蛋白35g/L，总胆红素455μmol/L，凝血酶原活动度30%。最可能的临床诊断是( )

A．急性重型肝炎
B．亚急性重型肝炎
C．慢性重型肝炎
D．急性黄疸型肝炎
E．淤胆型肝炎