题干

随着生活水平的提高,扫地机器人逐步进入普通家庭,有先进的传感器系统.如图所示.扫地机器人具有主动躲避障碍物、自动吸尘、自动返回充电等诸多智能功能,以下关于扫地机器人说法正确的是(  )

A:机器人利用超声波反射定位能更精准地主动躲避障碍物

B:机器人的电动机工作是利用了电流的磁效应

C:机器人自动返回充电时,把电能转化为化学能

D:依照机器人自身体积尽可能小的设计原则,集成电路的材料可以使用纳米材料制成

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答案(点此获取答案解析)

A,C

同类题3

根据短文内容,选择适当的单词或短语填空, 使短文意思完整, 每个选项使用一次。

A. show me the building,    B. was rising ,   C. make a living,   D. could hardly sleep   E. took my taxi  F. pay you  
G. drive through downtown,      H. don't have any family left

    Twenty years ago, I drove a taxi for a living. One time in the middle of the night, an old lady in her 80s ____ . She gave me an address, and then asked, “Could you ____?”

    “It's not the shortest way,” I answered quietly .

    “Oh, I don't mind,” she said. “I'm in no hurry. I'm on my way to a hospice(临终医院). I ____ The doctor says I don't have very long.”

   I quickly reached over and shut off the meter(计价器). For the next two hours, we drove through the city. She____where she had once worked, the neighborhood where she had lived, the place where she danced as a girl. As sun ____, we got to the hospice.

    “How much should I ____?” she asked, reaching into her purse.

    “Nothing ” I said.

    “You have to____ ” she answered.

    “Oh, there are other passengers,” I answered.

    “You gave an old woman some moment of happiness”. She said: “Thank you.”

    I drove into the fine morning light. Behind me, a door shut. It was the sound of closing of a life. I drove aimlessly, lost in thought.  For the rest of the day, I ____. What if that woman had got an unfriendly drive, or one who was impatient to his shift? What if I had refused to take the run?