First, keep warm in the early spring. The temperature in spring has picked up, especially before and after the Qingming, but the climate in early spring is still cold, and it is often windy and dry. The air is dry and the temperature difference between day and night is big. Farmers should …

Many women feel that the use of pad is a very hygienic act, especially before menstruation and after menstruation. When there are many vaginal discharges, many women choose to use padding. However, the frequent use of pads will not only bring women cleanliness, but will easily make women p…

Rotary evaporators are mainly used for concentration, crystallization, drying, separation and coal recovery in the pharmaceutical, chemical and biopharmaceutical industries. The principle is as follows: under vacuum condition, the constant temperature is heated to …

This article will introduce the representative of the detection switch - micro switch (Figure 1). The micro switch is classified as a detection switch according to the purpose, but is sometimes used as an operation switch. Microswitches include a wide range of products of var…

Introduction is the introduction of foreign varieties directly or through simple selection and domestication for production. Tenebrio introduction precautions include the following:

First, the introduction must first determine the introduction objectives, clear production problems …

The characteristics of skin lesions are mainly skin and hair follicle lesions. There are proliferative lesions in the epithelial tissue, prominently over the skin, from white to yellow to form scab, inflammation bleeding, epithelial layer degradation after 2-3 weeks, scab site to stay Ther…

Plate heat exchanger instruction manual I. Overview Plate heat exchanger is the ideal equipment for liquid-liquid, liquid-vapor exchange. The utility model has the advantages of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area, convenien…

Ultrafine powder is the basis for improving the efficacy of medicines. Micronization of western medicine can improve the efficacy and reduce the dosage. The same is true for traditional Chinese medicine. After cell-level micro-pulverization, cell breakage greatly i…

Because eating too much or too little feeding will affect its normal growth and development. Excessive feeding can easily lead to indigestion, diarrhea and other gastrointestinal diseases. Insufficient feeding can cause piglets to undergo stress response due to hunger, which is not conduci…