Knowledge

Shake the ink well before writing: For some whiteboard markers whose ink may settle, gently shaking the pen body before writing can make the ink mix evenly and the writing color fuller.

With the passage of time, we will usher in the Western festival - Christmas (December 25). The Christmas Legend: Santa Claus is a character in Christian fairy tales. According to legend, he is the inc

The high-grade ballpoint pens have obvious trademarks and model marks on the pen holder, and there are also obvious brand names.

The end of the ball seat is easy to wear (the material of the ball seat is nickel-platinum copper or stainless steel, which is much easier to wear than the ball). Doing so will cause the balls to fall

Neutral pen, short for neutral ink ballpoint pen, originated in Japan and is a novel writing tool that is currently popular in the world.

The pen head balls used in oil-based ballpoint pens are mostly made of stainless steel or hard alloy materials.

Water-based ballpoint pens are also known as ballpoint pens or ballpoint pens. Ball-point pens whose barrels and covers are made of plastic injection molding are called all-plastic ball-point pens;

The pen is stronger and more durable than ordinary pens, but if it is used and stored improperly, it is often impossible to write words.

The writing principle of the ballpoint pen is mainly to use the direct contact between the ball and the paper surface to generate friction when writing, so that the ball rolls in the ball seat, and th

A ballpoint pen is a pen that rolls out the writing medium through a ball at the front of the pen or refill.

Take a piece of chalk, let the students look at it, break it from the middle (be careful not to grind the cross section), and then connect the two pieces of chalk together.

Teachers often need to write and draw on the blackboard to explain. In a class of 45-50 minutes, we have to erase and write several times.