What is the use of KN95 masks
Everyone knows that KN95 masks can protect against the new crown pneumonia virus. But how should I choose a mask? Today, I will introduce you to the knowledge of KN95 masks.
What are the specifications of disposable syringes?
The specifications of disposable syringes are measured by scales. There are scales on the surface of the syringes, which are used to mark the amount. So what are the specifications?
Design of disposable injection syringe
The disposable injection syringe consists of a syringe with a small hole at the front and a matching piston rod. The ejector is used to inject small amounts of liquid or to inject or withdraw it from areas that are inaccessible by other methods. When the core rod is pulled out, liquid or gas is sucked in from the small hole at the front of the syringe, and the liquid or gas is squeezed out when the core rod is pushed in. The process of drawing or injecting gas or liquid with a syringe and a syringe is called injection.
These 5 ways to wear N95 masks are a waste!
1. One-time wear multi-layer N95 mask In fact, wearing multiple layers of N95 masks at one time is not necessary, but harmful: one is that it affects the air tightness and leaks more; the other is that breathing is blocked, and it is more likely to be infected if you inhale hard. Correct way