题干

下列现象中利用了熔化吸热的是(   )

A:运输食品时利用干冰降温防止食品腐烂

B:天热时向地上洒水会感到凉快

C:在发烧的病人头上放冰袋以缓解症状

D:向可乐饮料中加冰块会使饮料变得更凉

上一题 下一题 0.0难度 选择题 更新时间:2020-03-12 08:43:58

答案(点此获取答案解析)

C,D

同类题4

阅读下列短文,从下面每小题的 A、B、C、D 四个选项中选出最佳选项。

E

    Artificial intelligence(人工智能), or AI in short, is the science of giving computers and machines ability to think and work like humans. AI scientists and engineers have made a lot of cool technologies.

    AI is rapidly catching up with the human ability to read faces. As a result, facial recognition(识别)is used a lot in the world. Chinese police use this technology to identify criminals(罪犯).Once they caught a criminal when he attended a concert. It also checks the ID of ride-hailing(网约车)drivers and lets people pay for things with a smile.

    AI is also used in self-driving cars, which are believed to be the future of driving. Most drivers may wave or nod at passers-by to let them cross the street, but self-driving cars don't have this ability. Carmakers are testing a light signal system to help them "speak" to humans. The system can show what self-driving cars will do. For example, if a driverless car is yielding(让路), it will flash two white lights side to side. A rapidly flashing light tells passers-by that the car is about to speed up.

    Service Robots also show you know powerful AI is. Imagine this—you come back home from school and your robot housekeeper is waiting for you at the door. After dinner, he teaches you to play the piano, just like a real music teacher. Such thoughts will soon happen in the real world. In the future, more and more service robots will become good home helpers.

    AI is so powerful that it can help human beings and even replace us in many jobs.