26-08-22
EU Warns These CE Certificates Are Forged! To identify the authenticity of the mask certificate, see here _ authentication EU Warns These CE Certificates…

Original Title: EU Warns These CE Certificates Are Forged! Identify the authenticity of the mask certificate. Look here. Not long after the FDA certificate was named, the CE certificate came again! EU: These CE Certificates May Be Invalid, 21…

Original Title: EU Warns These CE Certificates Are Forged! Identify…


Gratis
26-08-22
Design and Construction Organization Plan of Lightning Protection Engineering (I) _ Grounding Design and Construction…

Original Title: Lightning Protection Engineering Design and Construction Organization Plan (I) The lightning protection project needs to be implemented in an organized and step-by-step manner to ensure the quality and duration of the project. Today, Junhe…

Original Title: Lightning Protection Engineering Design and…


Gratis
26-08-22
How many minutes does it take to drill 1 meter by drilling machine _ rock drill How many minutes does it take…

Original title: How many minutes does it take to drill 1 meter with a drilling rig? YWG series down-the-hole drilling machine is a new type of highly integrated down-the-hole drilling machine independently developed by our company. The machine adopts full…

Original title: How many minutes does it take to drill 1 meter with a…


Gratis
26-08-22
The high-content seeds of industrial hemp have passed the identification in Yunnan. What do the seed industry think? _ Hemp The high-content seeds of…

Original Title: High-Content Seeds of Industrial Hemp Passed Yunnan Identification, What Do Seed Industry People Think? Yunnan is a magical land with a long history of agricultural cultivation. Flue-cured tobacco and corn are common crops for farmers.…

Original Title: High-Content Seeds of Industrial Hemp Passed Yunnan…


Gratis
26-08-22
What are the guard column and the in-line filter for liquid chromatography? How to use it? _ Impurities What are the guard column and…

Original title: What are the guard column and online filter of liquid chromatography? How to use it? In the previous video of ChromClass, we mentioned the protective column and online filter of liquid chromatography. At that time, some students were very…

Original title: What are the guard column and online filter of liquid…


Gratis