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毛坯主要有铸件、锻件、型材和焊接件()

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题目:

毛坯主要有铸件、锻件、型材和焊接件()

答案:

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参考答案:黑箱(盒)解析:[知识点] 软件测试的方法 [评析] 软件测试的方法有3种:动态测试、静态测试和正确性证明。设计测试实例的方法一般有两类:黑盒测试方法和白盒测试方法。黑盒测试方法主要有:等价类划...

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题型:阅读理解

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     Surface Exploration. Robots make great explorers on planets,moons,and other landing areas.

Aside from Earth,just about every surface in the solar system is unsafe for humans to explore.The

air on most other planets is insufficient for humans to breathe,making it necessary to wear a space

suit and oxygen equipment.The temperatures on these surfaces are much too hot or much too cold

for any humans to withstand.Plus there would be complications with radiation,weather,and a lack

of gravity.Robots have much less limitation in these areas and can survive much longer under these

conditions.

     Data Collection. Robots are designed for collecting scientific data.Robots are also able to

perform many tasks at one time and can process information much quicker and more efficiently.

Important scientific projects from detecting minerals,analyzing ground samples,and finding water

are all performed much quicker and more accurately(精确地)by robots.

     Cost Effective. The use of robots has made the cost of space exploration much less expensive

than it would cost for humans to do the work.In order to successfully send humans into space we

would need to build a vehicle that can not only carry humans,but also have enough food and water to

keep them alive for the duration of the trip.Moreover,robots have no problems working for hours on

end.Robots never complain,they don't require food or water,and they never need a bathroom break.

     Space Travel. Over the past 30 years or so there have been many different types of robots used

successfully in the exploration of space.Perhaps the most famous and successful robots are the Spirit

and Opportunity who have both been exploring the surface of Mars.They have both been very

successful with experiments on soil and rocks and have even found evidence of water in Mars' history.

1.According to the passage,which of the following is NOT true?

A.The use of robots in space exploration costs more than the use of humans.

B.It may be dangerous for human to explore the solar system except the earth.

C.Both the Spirit and Opportunity have found the evidence of water in the Mars.

D.Many different types of robots have explored the space successfully.

2.Which column of the passage could come from?

A.Education.  

B.Finance.

C.Travel.  

D.Science.

3.The underlined phrase "withstand" most probably means "________".

A.arise  

B.bear

C.defeat  

D.diverse

4.What is the writer's attitude in writing this passage?

A.Negative.  

B.Persuasive.

C.Subjective. 

D.Objective.

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