In 2018, the United States, Argentina, Australia, Austria, Chile and other 35 countries have legalized medical cannabis, while the United Kingdom, France, Belgium, New Zealand and other nine countries have legalized some medical cannabis drugs. The United Nations Commission on Narcotic Drugs w

Characteristics of LED plant lamp:1. The effects of different wavelengths of light on plant photosynthesis are different. The light needed for plant photosynthesis is about 400-700 nm. 400-500 nm (blue) light and 610-720 nm (red) light contributed most to photosynthesis.2. Blue (470 nm) and re

In the process of production, we always encounter the phenomenon that one, one or several beads can't be lighted when we test some beads after sticking the board. In view of this phenomenon, this paper makes a summary:Dead lamp in welding process1. Common welding methods can be divided into