Ant Manor: There is usually a small hole on the pen cap of the pen? Mainly for? Should I prevent liquid leakage from the refill or prevent accidental swallowing and suffocation? This is the title of Ant Manor. There is usually a small hole on the pen cap for the pen? Mainly for? There are two options for the answer: prevent liquid leakage from the refill or prevent accidental swallowing and suffocation. It is not clear that there is usually a small hole in the pen cap of the pen, mainly for? Students with the answer, let’s take a look at the question of Ant Manor: There is usually a small hole on the pen cap of the pen, mainly for? Let's analyze the correct answer.
Ant Manor Title: Pen cap for writing pen
There is usually a small hole on the pen cap for writing pen?
Prevent liquid leakage of the refill
Prevent accidentally swallowing and suffocating
There is usually a small hole on the pen cap of the ant manor pen. Answer analysis
Neutral pen oil ingredients are mainly chemicals. If eaten into the gastrointestinal tract, it will show symptoms such as abdominal pain, diarrhea, nausea, vomiting, etc. If the throat or trachea is stimulated, dry throat, sore throat, and irritating cough may also induce asthma attacks.
If laryngeal edema and pulmonary edema , dyspnea will show dyspnea , which is life-threatening. After eating the gastrointestinal tract, if the gastrointestinal tract is absorbed, it spreads through the blood to the organs and tissues throughout the body, it will affect the metabolism and function of the organs and tissues. The fragrance of the refill core of
is actually produced by adding to synthesize . It is very likely to contain benzene, aldehydes and other substances. Although the content of these substances is minimal, long-term contact is harmful to children's health. Frequent and long-term use of these stationery will definitely be detrimental to children's health. Adding fragrance to the refill core of
will contain organic solvents, and organic solvents are chemical substances and are volatile. These solvents enter the human body through volatility and stimulate the mucosa of the respiratory tract. In severe cases, they will cause harm to the child's nervous system and blood system. Children will experience dizziness, nausea, insomnia and other discomfort symptoms.
Pencil core is made of graphite and clay. When the graphite content ratio is high, the characters written are clearer; when the clay content ratio is high, the color of the lettering will become lighter. Pencils can leave traces on paper because the pencil core rubs against the paper, blocking the "fiber gap".
Ant Manor Expansion Reading: The pen cap of the pen
Pencil core is divided into 18 models according to its use and standards. The commonly used models are HB and 2B. "H" is the abbreviation of the English "hard", which represents the hardness of the pencil; "B" is the abbreviation of the English "black", which represents the content of graphite, and can also be understood as the "degree of the color of the font" written. Pencils marked "HB" are the most common pencils, representing moderate hardness and color, suitable for writing, while pencils marked "2B" have slightly higher graphite content than the "HB" model.
If Arabic numerals are added before "H", it represents the hardness of the pencil. Arabic numerals are added before "B", it represents the "lead core concentration" (graphite content) of the pencil. In my country's standardized examinations, the default "2B" pencil is the standard font color. In addition, the length of pencils in China is generally about 18CM, with the optimal diameter between 4.8 and 5.2mm, the diameter of the pencil core is about 1.2mm, and the outer material is mostly "wooden", and hexagonal or round is the most common.
There are two materials for making pencil cores. In the early years, the pencil cores contained a certain proportion of lead, but as the technology matured, the lead was removed. Most of the pencils circulating on the market were mixed with graphite and clay. When the ratio of
clay is higher than graphite, the written font will be lighter, and the strength of the pencil core will become stronger as the proportion of clay increases; when the ratio of graphite is higher than that of clay , the color of the written font will become darker, and the strength of the pencil core will become weaker as the proportion increases.
The main raw material for making pencil cores is graphite, which is the "softest ore" among carbon materials. Its structure is "hierarchical". Although mixing with clay will destroy the atomic structure of graphite, its internal structure still exists and is still in a "sheet structure". In addition, the texture is soft and plasticity is strong, so it is suitable for serving as a "refill core".
Speaking of this, we have to mention graphene. Graphene is a "single crystal two-dimensional carbon material" extracted from graphite. It was discovered by two British scientists. The two scientists first made graphite into "graphite sheets", and then used special tape to repeatedly stick and tear them open until only a thin sheet composed of "single layer of carbon atoms" is left on the tape. This is graphene.
Ant Manor Answer: Pen cap for writing pen
There is usually a small hole on the pen cap for writing pen?
Prevent liquid leakage of refill
Prevent accidental swallowing and suffocation
Answer: Prevent accidental swallowing and suffocation.
or more is the title of Ant Manor: There is usually a small hole on the pen cap of the pen? Mainly for? I hope you will like the answer.
In addition, the title of Ant Manor: Which of the following historical stories is the Idiom Hongyan’s Book originated from? The correct answer is: Su Wu Shepherd HTML . Have you all answered correctly?
