At present, the fertilization structure in the fruit industry is still very unreasonable. There are widespread misuses of fertilization, such as unscientific fertilization, insufficient fertilizer input, and unbalanced fertilization structure. This not only results in .......

First, finishing Datian. Grab sunny days and early ploughing and drying up the soil, ripen the soil, improve permeability, improve physical and chemical properties, in order to increase its capacity for supplying fertilizer, water supply, and gas supply, so that rice can b.......

Fuel pump mainly by the pump, permanent magnet motor and the shell of three parts.

The working principle is: After the permanent magnet motor drives the pump body to rotate, the fuel is sucked in from the oil sump, flows through the inside of the electric fuel pump, and then is .......