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【简答题】
如图所示活动式工作架由4根钢管组成。所有交叉支撑、横撑与钢管的连接均可视为铰接，整个结构在两个水平方向均为侧向不动体系。设荷载设计值G作用于刚性工作平台中心，验算钢管是否满足设计要求。钢材为Q235，钢管为Φ50×3.5，A=5.11cm 2 ，i=1.65cm，f=215N/mm 2 。
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反馈参考答案：
举一反三
【简答题】在环保工作中,要把()、源头治理放到首位。
【简答题】由梅森增益公式可知，改变系统的输入输出在的情况下，不影响系统的固有运动形式。
【简答题】What is the main idea of this report? It is the introduction to the World __________ theme for 2003.
【多选题】What should be included in an introduction for a process analysis essay?
A.
Your introduction should define the process or name the thing to be made or done.
B.
You can tell the reader what materials, equipment, tools and skills are needed for the task.
C.
You may also include the preliminary preparations for the process.
D.
Write a clear thesis statement.
【多选题】What should be included in an introduction for a process analysis essay?
A.
Your introduction should define the process or name the thing to be made or done.
B.
You can tell the reader what materials, equipment, tools and skills are needed for the task.
C.
You may also include the preliminary preparations for the process.
D.
Write a clear thesis statement.
【多选题】What are the elements in the structure of a product introduction?
A.
introduction
B.
outline
C.
main body
D.
summary
E.
conclusion
F.
Questions and Answers
G.
farewell
【简答题】翻译下列短语: 1、留学生办公室 2、回电话 3、捎个口信 4、一杯水 5、10分钟之内 6. in the following three hours 7. passengers' booklet 8. sharp words 9. pay no attention 10. at the moment 翻译下列句子 11、麻烦您请科林斯小姐接电话好吗? 12、请再说一遍您的电话号码。 13、请问...
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