题干

仔细观察图甲,说明力的作用效果不仅跟力的大小、方向有关,还跟力的____ 有关;观察图乙发现,将滑动变为____ 的方式可以____ 摩擦.

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答案(点此获取答案解析)

作用点,滚动,减小

同类题3

根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。   

The Winner's Guide to Success

    Do you know what makes people successful? To find out the answers, an American scholar recently visited some of the most successful people around the world. ____

    Be responsible for yourself

    Sometimes you may want to blame others for your failure to get ahead. In fact, when you say someone or something outside of yourself is stopping you from making success, you're giving away your own power. ____

    Write a plan

    It is very difficult to try to get what you want without a good plan. It is just like trying to drive through strange roads to a city far away.____ Without this "map", you may waste your time, money and also your energy; while with the "map" you'll enjoy the "trip" and get what you want in the shortest possible time.

    Be willing to pay the price

    ____ So you must be ready to work hard — even harder than you have ever done. If you are not willing to pay the price, you won't get anything valuable.

    ____     

    It seems to us that everyone knows this. But it is easier said than done. When you are doing something, you must tell yourself again and again: Giving up is worse than failure because failure can be the mother of success, but giving up means the death of hope.

A. Never give up.

B. Nothing is easy to get.

C. A good plan is like a map to you.

D. Here are some keys to success that they give.

E. Some people achieve success much later in life.

F. You're saying, "You have more control over my life than I do."

G. Someone else's opinion of you doesn't have to become your reality.