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We may be able to predict the future development of science and technology, but we can only guess how human beings will use them.版本一(1) Air damping type time relay is also called air bag type time relay. It delays according to the resistance generated by air compression. Its structure is simple, its price is low, and its delay range is large (0.4 ~ 180s), but its delay accuracy is low."Then it was the old method of tracing armour-piercing firebombs that repelled the attacks of the big wasps twice. There was another very special sound from the position. At first we thought there was another big wasp coming, But after looking at it for half a day, I didn't find anything. After a little while, It is also the kind of special sound that is getting closer and closer. Only then did I recognize that it was not the "buzzing" sound of the big wasp, But a sound of "knowing, knowing, knowing, knowing, knowing, Taken out with 'creaking', It's like a lot of people grinding their teeth together, Then a piece of black came running in the direction of the position. This time the direction is straight ahead, At first those things were far away from us and we could not see them clearly with our naked eyes. It was an instructor with a telescope who looked through the telescope and saw that the thing was a lot of mice. And they are all very big, After the news spread throughout the position, I have all my comrades, All ready for battle, Knowing that this is like one of those big wasps, It is certainly not a good fault, Just thinking of starting to fight the newcomers when it comes closer, I didn't think they were about 100 meters away from the position. It stopped suddenly, At the beginning of digging holes collectively, I felt that they were digging holes faster than running on the flat ground. One by one, they almost disappeared from the ground in an instant. Soon, a large area of dark mice disappeared. Looking through binoculars, on the ground where they disappeared, there were many holes the thickness of sea bowls, which were almost denser than craters.不知几位爷想要喝什么样的茶？黄豆度其神情，心中暗想高兴倒未必，怕是惶恐的很，一边笑道：都说什么呢？刚才不是挺热闹的嘛。黄胖子说得对，普通商人赚的是辛苦钱，有背景商人发的是横财。