Agricultural fertilizers to remove pests

There are many pests in farmyard manure, such as cockroaches and worms. If they are not treated or handled improperly, the pests will multiply and will harm the crops after application. The chicken and duck manure are flattened, dried and simmered, and 1 kg of octyl sulfate is mixed per cubic mete-----

How to deal with black spots in the viewfinder

[ Huaqiang Security Network News ] There are black spots in the viewfinder. I believe that many photographers will encounter it. Even if it does not affect the shooting effect, it still affects the shooting mood. How do the viewfinder have black spots? There are black spots i-----

What features do you know about Gigabit PoE switches?

With the continuous expansion of the application of network cameras, the application of intelligent data communications equipment such as POE switches is also growing. A Gigabit PoE switch is a switch that can provide the PD device with a network or can provide power to the PD device through a netw-----