"The pumping principle of the spool type vacuum pump is similar to that of the sheet pump. When the structure of the two is different, the spool type vacuum pump uses the spool mechanism to change the volume of the west air chamber, so it is called Huafa pump." Huafa pump is an old one. Pu ---MORE---
Core Tip: Why do people sleep? In simple terms, there are three reasons: First, the heart and kidney do not pay, the second is blood deficiency, and the third is stomach disharmony. Today, Xiao Bian teaches you three strokes of old Chinese medicine recommended treatment of insomnia, to hel ---MORE---
First, cultivating and covering orange orchards. The cultivating in the orange orchard can not only play the role of loose soil in drought protection, but also clear the weeds in the garden and promote the physical and chemical functions of the soil. Orange orchard coverage can play a role in drou ---MORE---
In daily maintenance of bearings, lubricants should be filled as required. The holes sealed at both ends are lubricated with grease. When reloading and reloading, do not hard knock hard, especially not to hit the outer ring of the bearing, you should tap the inner ring of the bearing gently. Tens ---MORE---
The National Development and Reform Commission said that the end of the edible oil price limit period has spread like wildfire, but it has not been formally confirmed by the NDRC. The major edible oil brands are ready to raise their prices, and no one has the guts to be the first to rise. ---MORE---
1. Cows are resistant to heat and cold: In summer, the feeding and management of dairy cows is mainly to prevent heatstroke and cool down, so as to alleviate the damage of cows caused by high temperature and high humidity. Some farmers only pay attention to regulating the aquaculture environment a ---MORE---
The occurrence of this disease is widespread and the damage is severe, resulting in a large amount of fallen leaves and a huge loss. The pathogen is a fungus of the genus Aspergillus spp. I. Symptoms: When the symptoms are detected, brown spots appear on the leaves and gradually expand into round ---MORE---