题干

小明同学学过核能发现:现在建的核电站是利用核能来发电;而原子弹也是利用核能放出的大量的能量达到摧毁的目的.它们工作的过程相同吗?它们有什么异同点?

上一题 下一题 0.0难度 选择题 更新时间:2015-02-05 08:09:59

答案(点此获取答案解析)

它们的原理相同,都是利用了链式反应工作的;但两者之间也是有区别的,核电站的核反应堆中发生的链式反应,是可以控制的,而原子弹爆炸时发生的链式反应,是不加控制的.

同类题3

阅读理解

Bicycle Safety

    Operation  Always ride your bike in a safe, controlled manner on campus. Obey rules and regulations. Watch out for walkers and other bicyclists, and always use your lights in dark conditions.

    Theft Prevention Always securely lock your bicycle to a bicycle rack---even if you are only away for a minute. Register your bike with the University Department of Public Safety. It's fast, easy, and free. Registration permanently records your serial number, which is useful in the possible recovery of the bike stolen.

Equipment.

    Brakes  Make sure that they are in good working order and adjusted properly.

    Helmet A necessity, make sure your helmet meets current safety standards and fit properly.

    Lights Always have a front headlight---visible at least 500 feet in front of the bike. A taillight is a good idea.

Rules of the Road

    Riding on Campus  As a bicycle rider, you have a responsibility to ride only on streets and posted bicycle paths. Riding on sidewalks or other walkways can lead to a fine. The speed limit for bicycles on campus is 15mph, unless otherwise posted. Always give the right of ways to walkers. If you are involved in an accident, you are required to offer appropriate aid, call the Department of Public Safety and remain at the scene until the officer lets you go.

Bicycle Parking Only park in areas reserved for bikes. Trees, handrails, hallways, and sign posts are not for bicycle parking, and parking in such posts can result in a fine.

If Things Go Wrong

    If you break the rules, you will be fined. Besides violating rules while riding bicycles on campus, you could be fined for:

No bicycle registration---------------------------------$25

Bicycle parking banned------------------------------$30

Blocking path with bicycle ---------------------------$40

Violation of bicycle equipment requirement -----------$35