The role of the cardiovascular system 1 Strong heart strengthens myocardial contractility and improves heart function without increasing myocardial oxygen consumption 2 Vascular expansion of the coronary arteries, increase blood flow to the myocardium; expansion of peripheral blood vessels, incr
Read moreRussian catfish are mainly distributed in the Caspian Sea, Azov Sea, Black Sea and rivers that communicate with them. In the early 90s of the 20th century, China was introduced into China. Breeders of our province also used Russian catfish as breeding objects. As it is a new species of freshwater f
Read moreWhen the male and female cocks are mated, the cock is stepped on the hen's back and the hen's vagina is pulled out of the cloaca to receive the semen from the cockerel. After mating, the sperm travels along the fallopian tube to the horn end sperm, after the ovulation, the egg enters the f
Read moreH7N9 has not been studied thoroughly. H10N8 has taken one person's life. The Jiangxi Provincial Department of Health confirmed on the 18th that a 73-year-old woman in Nanchang City, Jiangxi Province, had H10N8 bird flu and died of respiratory failure and shock on December 6. The confi
Read moreIntroduce the use of several commonly used fertilizers. The ammonium bicarbonate should be applied in depth. Because ammonium bicarbonate is very unstable, it is most easily decomposed into ammonia and volatilizes. The higher the temperature, the greater the volatilization loss, so it should not be
Read moreThe persimmon is the fruit of the persimmon plant Persimmon, and it is when it is time for the market. Persimmons are mainly divided into two types: persimmon and astringent persimmon. When the former is ripe, it has already been astringent, while the latter needs artificial astringent. In additi
Read moreIn the winter, the greenhouse is closed for a long time, and the humidity in the greenhouse is high. Loofahs are most vulnerable to anthracnose, brown spot, and blight, because these three diseases are fungal diseases. Symptoms in the leaves are similar, some vegetable farmers Difficult to identif
Read morePreservatives are added to the ham to prolong shelf life to prevent bacteria from damaging foods, preservatives can kill bacteria, and can potentially be harmful to the human body. This is where people are most concerned about processed foods. Food scientists are constantly searching for preservat
Read moreFirst, choose good breeds. At present, large-grained edible varieties suitable for high-yield cultivation mainly include "three-way eyebrows" and "big-grain incense." Under the same conditions, large grain varieties can produce more than 10% more than small grain varieties. Sowi
Read moreIn the diet, the elderly should pay attention to the following seven taboos: 1, bogey more. Should eat less meals, avoid overeating. Excessive diet will cause acute gastrointestinal dilatation, causing gastrointestinal digestion and absorption disorders. Studies have shown that eating less often
Read moreOften doing some body detoxification to avoid the formation of acidic conditions in the body can effectively remove body odor and make the body fresh and refreshing. The same is the body's taste, why are some of the slightest, some subtle fragrance? This is because human body odor is a mixtur
Read moreA particle size analyzer is an instrument that physically measures the size and distribution of solid particles. According to different test principles, it is divided into sedimentation particle size analyzer, sedimentation balance , laser particle size analyzer , optical particle counter , resistiv
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