问题 单项选择题

某机械厂单跨厂房,内有2台Q=20/5t软钩吊车,工作级别A6(重级工作制),每台吊车有4轮,一边轨道上最大轮压Pk,max=230kN,按《钢结构设计规范》GB50017—2003第3.2.2条,考虑吊车摆动(卡轨)引起的横,向水平力作用在一边吊车梁上的总和∑Hk=______kN。

A.92
B.87.4
C.46
D.138

答案

参考答案:A

解析:
按2台吊车,每吊车一侧有2轮,软钩吊车α=0.1,
∑Hk=2×2×0.1×230=92(kN)

材料题

阅读下列材料,并回答问题 :

材料一:

(1)根据材料一,结合所学知识,指出该水利工程的名称是什么?修建者是谁?                                                                                                                                                                      材料二:图中人物主持修建的水利工程消除了岷江水患,灌溉了大片农田,使成都平原变得“水旱从人,不知饥馑”,因而获得了“天府之国”的美称。两千多年来,一直造福于民。   ——摘自人教版《历史》七年级上册  (2)根据材料二,指出被称为“天府之国”的是什么地方?                                                                                                                                                                   (3)根据材料一、二,结合所学知识,说明2000年,该工程被联合国教科文组织列入“世界文化遗产”    名录的原因。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            

阅读理解

阅读理解。

     Three more cattle farms in Andong,North Gyeongsang Province,were found to have been

infected with the deadly foot-and-mouth disease,Nov. 2 2010,Thursday. People fear that livestock

farms in other parts of the country could be hit by the virus soon.

     On Monday,the disease was first detected on two pig farms in Andong,about half a year after

the last disease broke out in Korea. A cattle farm in the area also fell victim to the animal disease

the following day.  

     The Ministry for Food,Agriculture,Forestry and Fisheries made sure that three more cases of

foot-and-mouth disease appeared on Thursday and decided to kill all the animals at the farms and

others at nearby places to stop the spread of the virus to other regions. Over 800 cows and pigs

within a 500 meter range of the infected farms were killed and buried underground.  

     "Three suspected cases were reported Wednesday,near the pig farms where the first outbreak

was reported. The laboratory tests today showed that all three cattle farms were infected with the

disease," a ministry official said. Two newly infected cattle farms were less than 4 kilometers away

from the two pig farms,while the third one was only 2. 5 kilometers away.  

     The ministry also said another cattle farm in Andong reported suspected cases of foot-and-mouth

disease on its livestock Thursday,indicating the disease will likely continue to spread across the city

and possibly beyond.  

     The government has culled more than 33,000 animals near the affected farms Monday alone under

its disease prevention program. Additionally,all 84 livestock markets across the nation were closed

Wednesday for a period to prevent spread of the disease.

     No suspected cases have been reported outside of Andong,but the government Thursday decided

to destroy an additional 22,000 pigs at two farms in Boryeong,South Chungcheong Province.

1. Last time foot and mouth disease          .

A. broke out in North cattle farms

B. was controlled as soon as possible

C. happened in June,2010

D. destroyed almost all cattle in cattle farms

2. How did the government deal with the disease?

A. The government controlled only the two farms.

B. The government had more animals killed.

C. The government tried to cure the sick animals.

D. The government hated to kill animals.

3. The underlined word "culled" has the same meaning as          .

A. treated

B. killed

C. bought

D. sold

4. From the last paragraph we can know that          .

A. 22,000 pigs have been infected with the disease

B. 22,000 pigs will be moved to other farms

C. Boryeong is also an infected area

D. 22,000 pigs will go down to their death

5. In which part of a newspaper can you most probably read the passage?

A. Today's News  

B. History and Culture

C. Entertainment

D. Science