Why there are two holes in the ballpoint pen body, and why there is a small hole in the ballpoint pe

Piece by piece of ruins, there are crying voices everywhere, the rescue team is crazy to save people, but often can't be saved, and the photographer who followed only took a **, and threw down the camera to help, because that scene makes it impossible for you to stand and watch. Most of the school's main school building collapsed, and classes were taking place at the time, with almost more than 100 children crushed underneath. It's all elementary school students.

Some fighters who appeared to be firefighters had snatched a dozen children and more than thirty bodies from the rubble, and looking at the tiny children, wearing red scarves who could never open their eyes again, she said she suddenly felt that she had lost the courage to speak. However, at the most critical time of rescue, suddenly the ruins of the teaching building moved because of aftershocks and crane operation, and it may collapse again at any time, and then it is very dangerous to enter the ruins for rescue, which is almost equivalent to death. When a few soldiers heard this, they didn't care, and turned their heads to drill into it again, and then the collapse happened, and a huge concrete block was sinking down, and the soldiers who turned in immediately dragged the other fighters, and the two gangs of people pulled on it, and finally the soldiers on the ruins were dragged to safety, and a soldier who had just brought out a child from the ruins knelt down and cried, and said to the person who was dragging him, you let me save one more, please let me save another one!

I can save one more!

Everyone cried when they saw this, but everyone had nothing to do but watch the ruins collapse for the second time. Later, the children were dug up, but only one was still alive, and all of them wept silently as they watched the young warriors cry out in the rain with the surviving little girl in their arms and run to the tent where the rescue was located.

It is ventilated to be able to write fluently.

Able to write fluently.

Ventilation, the oil of the oil pipe can circulate.

The small hole on the cap of the pen is not trivial, and the cap is easy to plug in and pull out when the atmospheric pressure inside and outside the refill is consistent. Primary school students have the habit of mouthing and capping, once inhaled can save lives, and form a ventilation hole.

According to the National Standard of the People's Republic of China - General Requirements for the Safety of Student Supplies (GB 21027-2007), the caps of writing pens, markers, correction pens and watercolor pens shall comply with at least one of the following 3 provisions:

1.The cap size is large enough (greater than 5 mm for the non-passing part when entering vertically into a gauge with a diameter of 16 mm).

2.There needs to be a continuous air passage of at least millimeters square on the cap body. Air passage can be provided by raised sections such as pen clips.

3.The cap should be at room temperature with a minimum ventilation of 8 litres at a maximum pressure difference of 8 kPa.

Eligible caps that meet this criterion do not necessarily have holes in them, but they all need to be enlarged or ventilated to reduce the risk of inhalation choking.