对长细比很大的轴压构件,提高其整体稳定性最有效的措施是()。 A.增加支座约束 B.

题型:单项选择题

问题:

对长细比很大的轴压构件,提高其整体稳定性最有效的措施是()。

A.增加支座约束

B.提高钢材强度

C.加大回转半径

D.减少荷载

考点:钢结构设计原理轴心受力构件轴心受力构件题库
题型:单项选择题

阅读下面短文并回答问题,然后将答案写到答题卡相应的位置上(请注意问题后的词数要求)。

【1】A safari park is a park in which wild animals are kept. They are mainly located in east or central Africa. They often occupy a very wild area, with mountains and rivers. To visit the park and look at the animals, people have to drive around in a car for a few of hours because the park is huge.

【2】In south Africa there is a safari park, which contains all sorts of wild animals like lions, elephants, rhinoceroses(犀牛), zebras, wild pigs, deer and giraffes.

【3】There is a wild road leading through the park, but nobody is permitted to walk on the road. Anyone traveling in the park has to go in a car because wild animals may fiercely attack people. From the car he may see almost every types of African wildlife. Some of these are getting scarce (稀有的) because people kill them for various reasons. For example, rhinoceroses are killed for their horns (角), which are used in traditional Chinese medicines for colds and headaches. Perhaps they will be seen only in museums and books one day.

【4】Travels may purchase food for the animals. They can feed them when they tour the park. Of course, they should not feed them in a close distance because the wild animals may attack people. In addition, they should only give proper food to the animals.

【5】A traveler may carry a gun with him in his journey. The gun is given to him by the government. However, it is not used for hunting. In fact, a seal is fixed to it. The traveler may fire at a wild beast to defend himself in case he is attacked. However, he has to prove to the government that he has been attacked and that he has not fired at a harmless animal.

小题1:List one of the reasons why travelers have to stay in a car during their visit.(no more than 6 words)

小题2:Why are rhinoceroses getting scarce? (no more than 7words)

小题3:What warning is given to travelers when they feed the animals? (no more than 15words)

小题4:How does the government know the gun is fired? (no more than 10 words)

小题5:What is the passage mainly about? (no more than 6 words)

题型:单项选择题

防腐剂在食品中的适用原则是在任何食品中都可以使用防腐剂来抑制微生物的繁殖。()

题型:单项选择题

简述强直性脊柱炎的主要临床症状。

题型:单项选择题

在抽样研究中,随着样本含量逐渐增大()

A.标准差逐渐增大

B.标准误逐渐增大

C.标准差趋向于0

D.标准差逐渐减小

E.标准误逐渐减小

题型:单项选择题

泵串联、并联工作的特点?

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