如图5-2-7所示,用夹剪剪直径为3mm的钢丝,若剪子销钉的剪切许用应力[τ]=90

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问题:

如图5-2-7所示,用夹剪剪直径为3mm的钢丝,若剪子销钉的剪切许用应力[τ]=90MPa,钢丝的剪切强度极限τ0=100MPa,则销钉的直径至少应为()mm。

A.1.8

B.2.6

C.3.5

D.4.3

考点:注册土木工程师岩土工程基础知识基础知识
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“If we don’t often wash our hands, we can pick up viruses(病毒)form many places and make ourselves ill,” a man from CDC says. Doctors always say every time when you touch your eyes, nose or mouth, you may be ill. In fact, one of the common(平常的) ways of catching a cold is by rubbing(擦拭)their noses or their eyes when there are viruses on their hands. If you don’t often wash your hands, especially when you’re sick, you may spread the viruses to others. You should wash your hands in these situations:
1. After using the washroom
2. After rubbing your nose or coughing.
3. Before eating or making food.
4. After touching animals.
5. After visiting a sick man.
6. When your hands are dirty.
There’re right ways to wash your hands. Follow these things to keep your hands clean:
1. Use warm water (not cold or hot).
2. Wash for 15 seconds.
3. Wash well under warm running water and dry them with a clean towel.
阅读短文,填表格。
Information Card
A way to protect against the spread of illness
    1   
 
Situations in which you must wash your hands
After using the   2 
Before making   3 
After visiting the   4  people
A correct way to wash your hands
Use   5  running water
Time needed to wash your hands
     6    
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