题干

请在图中标出通电螺线管的N极和磁感线的方向。

上一题 下一题 0.0难度 选择题 更新时间:2019-12-02 02:08:52

答案(点此获取答案解析)

解:如图所示:

同类题2

阅读理解

    The Intelligent Transport team at Newcastle University have turned an electric car into a mobile laboratory named “DriveLAB” in order to understand the challenges faced by older drivers and to discover where the key stress points are.

    Research shows that giving up driving is one of the key reasons for a fall in health and well-being among older people, leading to them becoming more isolated(隔绝) and inactive.

    Led by Professor Phil Blythe, the Newcastle team are developing in-vehicle technologies for older drivers which they hope could help them to continue driving into later life.

    These include custom-made navigation(导航) tools, night vision systems and intelligent speed adaptations. Phil Blythe explains: “For many older people, particularly those living alone or in the country, driving is important for preserving their independence, giving them the freedom to get out and about without having to rely on others.”

    “But we all have to accept that as we get older our reactions slow down and this often results in people avoiding any potentially challenging driving conditions and losing confidence in their driving skills. The result is that people stop driving before they really need to.”

    Dr Amy Guo, the leading researcher on the older driver study, explains, “The DriveLAB is helping us to understand what the key points and difficulties are for older drivers and how we might use technology to address these problems.

    “For example, most of us would expect older drivers always go slower than everyone else but surprisingly, we found that in 30mph zones they struggled to keep at a constant speed and so were more likely to break the speed limit and be at risk of getting fined. We're looking at the benefits of systems which control their speed as a way of preventing that.

    “We hope that our work will help with technological solutions(解决方案) to ensure that older drivers stay safer behind the wheel.”

同类题5

完形填空

        It might have been a really bad stressful day, feeling trapped inside by the cold and snow which surrounded us.My husband got dressed and 1that he was going outside to build a giant snowman.

       At first he stood alone2massive amounts of snow.Soon after a neighbor joined in.Then we reluctantly put on our snow gear and3outside.It wasn't long4we were smiling and enjoying the 5of snow that Mother Nature had provided.Others came to our yard one by one to give a  6in the making of our giant snowman.

       In the end we all stood back and7at what we had created.He was eleven feet high, twenty­five feet around at the base and 8with many household items supplied by various9People drove by and smiled.Some even stopped just to enjoy his10

       With the passing of time, the spring made its 11back into our yard and the snowman changed form12In a final effort to save what we created for just a little bit 13somebody stopped by and changed the snowman's 14to look like a rabbit.As I prepared for the start of another week, I decided to 15my e­mail before going to bed.I found a (an) 16message that contained the subject line17the snowman.

       The e­mail said:your neighbor looks on in disbelief!Now you people are relishing(享受)the sounds and smells, along with18of spring.But I am sure people will never forget the 19energy displayed in Mr.Snowman.You and your family keep it up, as this is what the world needs now.More power to you and your loved ones, keep  20with the world around!

       Perhaps it was more than a snowman we built that day.The message seems clear.Our environments will turn out to be what we make of them.The possibilities are endless and the choice is ours.

Notes

①reluctantly adv.勉强地,不情愿地 ②disbelief n.不相信