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Time relay is a kind of delay control relay, which does not immediately let the contact move after obtaining the action signal, but delays for a period of time before letting the contact move. Time relays are mainly used in various automatic control systems and start-up control circuits.4. There are no new varieties of lobsters at present, but crayfish grow differently in different regions. Shrimps are generally imported from the local area. In this way, lobsters do not undergo long-distance transportation, but also adapt to the local geographical conditions and are easy to survive. Where did the seedlings come from? Many people asked for seedlings online. First of all, do you have crayfish in your area? I don't think anyone who wants to raise lobsters now will say that there is no local one, If so, there will be crayfish collectors in the area. From April to May, the number of wild crayfish is very large, Find a shrimp dealer in the street, Let them help you collect, you can choose small specifications, so the price is cheap, small specifications dealers generally can't sell a good price, generally can buy around 5 yuan, of course, this depends on the local actual situation, if there is no local crayfish, shrimp seedlings are not in demand and worthless, more breeding is a little more popular. It is also easy to collect tens of hundreds of catties every morning, Generally, a kilo of 50-200 tails is good, On the same day, it will be transported back to the pond after simple disinfection. It will put about 100kg per mu. After putting it in, it will usually die. Dead shrimps will often be salvaged. Remember to repair the seedlings if you die. No matter whether you bought it from other places or someone else's pond, you will always die if you put it back. If you buy it locally, the price will be low and the cost of dying will not increase much.另外依然有些女人孩子在这里拾滩，翘儿也不好意思说她们。这是泥鳅，身后跟的是他弟弟黄鳝，还有妹妹锦鲤。　　按照规定，新来的警察不论国内职务高低，一律先当一至两个月的巡警，然后视职位空缺情况，公开竞聘安排工作。经过初步考试，冯力伟和邵国栋分到150公里外山区的一个叫巴力波的派出所当巡警。赵媛和杜春雨分到总部失踪人口调查处。董燕则和林冬生分到巴力波相邻的山区巡逻。不久，追随冯力伟而来的北京姑娘陆小红也在东扎下了根，从打工到自己做上了老板，树立了一个普通中国人的勤劳、聪慧、善2. Import a variable that does not exist, and the value is undefined.黄豆站起身道：你们说的都没错。