I believe that most people have ignored the special-shaped nut, and always feel that the shape of the mother is insignificant, a small nut is not taken seriously, and can not play a role in life. You are wrong, wrong, many things look small, but they are of great importance.
In our daily life, I believe there are a lot of people from time to time to hear what the plane exploded, the car accident hurt others, It is without rhyme or reason. in large machinery factory workers injured, caused the accident reason you know? Do you know how many screws and nuts are needed on an airplane? Some people think that tens of thousands, tens of thousands of nuts off one or two all right, proved to be wrong, on the plane of a screw nut less relevant personnel found will be repaired, each screw bears a force in each position, when the little nut screw will fall off, this part of the power will be out of control thus, resulting in a terrible accident.