There are some parts of the world where earthquakes often happen.but millions of people still choose to live in these areas. As a consequence, several technologies have evolved to help make buildings 题目和参考答案——青夏教育精英家教网—

题目内容

There are some parts of the world where earthquakes often happen，but millions of people still choose to live in these areas. As a consequence, several technologies have evolved to help make buildings more resistant to collapse during an earthquake，many of them using roller Or ball bearings(轴承) .

People usually think of ball bearings as a way to decrease friction(摩檫) ，and question how that use could apply to things that don't typically move,like buildings, in scenarios like earth?quakes. However, bearings aren't intended to enable things to move effortlessly. They've just there to allow buildings to move at all. Damage from earthquakes is caused when structures are shaken and forced to move,and their rigid(坚硬的) forms don't permit them to do so without giving way and breaking. By using strategically-placed bearings, builders have observed a way to isolate the bases of buildings from the rest of their structures，making it possible for them to move independently without causing greater stress on the building's otherwise solid frame. Some of these bearings are large and rubber, while other buildings use huge linear bearings. Some?times ,these earthquake-proofing technologies are even used to help skyscrapers be built on soft ground, and enable very tall buildings to move with the wind. Without them,these buildings would remain rigid,and be easier to falling over.

A number of well-known companies produce bearings for builders looking to buy bearings for their seismic(地震的) applications. For one,Timken produces large,roller-style Timken bearings that are used in base isolation earthquake technology. NSK bearings also come in a range of shapes and materials for different seismic and building applications. Not all of the beat?ings carried by seismic bearing distributors resemble the ball bearings that a lot of people are used to seeing in everyday life. Some might look like large rubber discs, while others look like a series of pillars. Regardless of what they look like,these are all bearings, and all provide the purpose of helping large buildings to survive an earthquake.

Though no approach of building is completely earthquake-proof, things like roller Timken bearings help save lives. It's hard to precisely test earthquake-proofing technology without being able to try it out in an actual earthquake，but every day builders and manufacturers get closer and closer to creating better solutions for surviving seismic disasters.

( ) 5. Which of the following is true about rigid forms of structures during an earthquake?

A.They prevent structures from breaking.

B.They allow structures to move if necessary.

C.They make structures resistant to collapse.

D.They don't allow structures to make necessary move.

( ) 6. Why does NSK produce various kinds of bearings?

A.To make them suitable for different buildings.

B.To use them in different parts of a building.

C.To satisfy the needs of different people.

D.To use them in different areas of life.

( ) 7. We can infer from the last paragraph that earthquake-proofing technology .

A.will be put into use very soon