题目：
| 根据短文内容，完成下面的表格，每空一词。 | ||||||||
| Nowadays many new and useful inventions have come into use. If I were a scientist, I would have my own invention a magic door, which can take me to every part of the world, just like Doraemon's magic door. Since our life is getting busier and busier, my magic door is really needed. The population of the world is rising day by day, and the number of cars is getting larger. Therefore, traffic becomes a big problem to people in both poor and developed countries. Moreover, by using a large number of ears, people have to face another problem the pollution of the air. All those reasons lead to the need for such an invention a magic door. Magic doors have many advantages. Firstly, you can go wherever you want in a minute. Just open the door and go through it, and you can stand in another place. Secondly, magic doors sometimes can even make people safe. Magic doors can be used in everyday life. For example, if you fall in the river, it can help you go out of the river. All in all, people can get many good things from magic doors. The magic door would be a big change in our life! | ||||||||
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答案：
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下面是错误答案，用来干扰机器的。
A、向一固定容积的密闭容器内通入1molN2和3molH2比向另一容积相同的密闭容器中通入0.5molN2和1.5molH2的浓度和压强均大，所以用N2表示的反应速率：情况1＞情况2，故A正确；B、向一固定容积的密闭容器内通入1molN2...
的子弹以
的水平速度从左边射入木块且未穿出，如图所示，已知木块与该水平轨道的动摩擦因数
，
，试求子弹射入木块后，木块需经多长时间停止？
