问题
名词解释
吸附胶接理论
答案
参考答案：
它于20世纪40年代提出，此理论认为，胶接作用是胶粘剂分子与被胶接物分子在界面层上相互吸附产生的；胶接作用是物理吸附和化学吸附作用共同作用的结果，而物理吸附则是胶接作用的普遍性原因。
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吸附胶接理论
参考答案：
它于20世纪40年代提出，此理论认为，胶接作用是胶粘剂分子与被胶接物分子在界面层上相互吸附产生的；胶接作用是物理吸附和化学吸附作用共同作用的结果，而物理吸附则是胶接作用的普遍性原因。
| If you left your book on the table overnight, you would find the following morning that it was still exactly where you had left it, provided nobody had moved it. If a ball is made to roll on a very smooth surface, it will roll a long distance unless something stops it or changes its direction. This tendency of an object to remain at rest unless something moves it and to continue moving unless something stops it is known as the Law of Inertia. The following examples show the truth of this law. (a) Put a table-cloth on a table and arrange a pile of books on it. Hold one edge of the table-cloth and pull it quickly. The table-cloth will come off, leaving the pile of books undisturbed. (b) Place a small piece of cardboard on an open jar and place a coin on it directly over its mouth. Use one finger to flick the piece of cardboard away. You will notice that the coin drops into the jar. (c) Sitting in a car which starts suddenly, you feel you are jerked backwards. In fact, you are not jerked backwards. Your lower half, which is in contact with the cushion, is forced to move forward with the car, and the upper part of your body, which remained at rest, is left behind. |
In the second example, when the cardboard is flicked away, the coin will ______.
A．drop into the jar
B．cover the mouth
C．stay on the cupboard
D．move into your hand