题干

关于惯性,下列说法中正确的是(   )

A:同一汽车,速度越快,越难刹车,说明物体速度越大,惯性越大

B:静止的火车起动时速度变化缓慢,是因为物体静止时惯性大

C:乒乓球可以快速抽杀,是因为乒乓球的惯性小的缘故

D:已知月球上的重力加速度是地球上的 16 ,故一个物体从地球移到月球惯性减小为 16

上一题 下一题 0.0难度 选择题 更新时间:2018-10-18 10:13:24

答案(点此获取答案解析)

C

同类题3

根据短文理解,选择正确答案。

    In choosing a friend, one should be very careful. A good friend can help you study. You can have fun together and make each other happy. Sometimes you will meet fair­weather friends. They will be with you as long as you have money or luck,but when you are down, they will run away. How do I know when I have found a good friend? I look for certain qualities of character,especially understanding, honesty and reliability(信任).

    Above all else, I look for understanding in a friend. A good friend tries to understand how another person is feeling. He is not quick to judge. Instead, he tries to learn from others. He puts himself in the other person's place, and he tries to think of ways to be helpful. He is also a good listener.

    At the same time, however, a good friend is honest. He does not look for faults in others. He notices their good points. In short, a friend will try to understand me and accept me.

    Another quality of a friend is reliability. I can always depend on a good friend. If he tells me he will meet me somewhere at a certain time, I can be sure that he will be there. If I need a favor,he will do his best to help me. If I am in trouble, he will not run away from me.

    There is a fourth quality that makes a friend special. A special friend is someone with whom we can have fun. We should enjoy our lives, and we would enjoy our friendship. That is why I especially like friends who are fun to be with. A good friend likes the same things I like. We share experience and learn from each other. A good friend has a good sense of humor too. He likes to laugh with me. That is how we share in the joy of being friends. And I know that he is looking for the same quality in me.

    When I meet someone who is reliable, honest, and understanding,I know I've found a friend!