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10-15% of aquatic plants and hidden objects are planted shallowly at the edge of the pond to create an environment for lobsters to inhabit and shell and reduce mutual killing. The influence of water quality on lobster yield cannot be ignored. During the breeding process, the PH value of the pool water is kept between 7.5 and 8.5, and the transparency is 30-40cm. Fresh water should be added frequently, quicklime solution should be splashed regularly, water quality should be adjusted, and diseases and shelling failure should be prevented. 2. Feed feed reasonably. Lobsters will kill each other when hungry and under-fed, so the feeding amount must be sufficient. Lobster feed is animal and plant feed. Plant feeds are wheat, aquatic plants, rapeseed cakes, etc. Animal feeds are miscellaneous fish, miscellaneous meat, livestock viscera, etc. At ordinary times, the feeding time, feeding amount and feeding method are determined according to the habit of lobsters falling in the day and coming out at night and the density of lobsters in the pond. 3. Scientific fishing. Young shrimps can grow to commercial specifications in 60-90 days under the condition of suitable temperature and sufficient feed. The seedlings will be released in March and will be caught in rotation around June, selling large ones and keeping small ones.两列火车发生了对撞的惨剧，131名乘客不幸遇难。唯一的幸存者大卫醒来后发现自己在费城医院的急诊室中，更奇怪的是他不仅得以生还，而且全身上下一点儿伤也没有。这次事件引起一个名叫伊利亚的黑人的注意，伊利亚天生手脚残废，命运多舛的他认定大卫身上有某种超自然的力量。男主角大卫能如此幸运地躲过劫难，究竟是老天的恩宠，还是冥冥中有不可思议的邪恶力量在控制著他？在伊利亚的引导下，大卫逐渐发现了其中的秘密…… 　　布鲁斯威利斯扮演的大卫是一位遭遇家庭危机的中年男人，在大学体育馆从事保卫工作，以前曾是美式橄榄球运动员。在一次从纽约返回费城的路上，大卫乘坐的列车发生事故。车上的乘客除了大卫全部遇难，而大卫却毫发未伤。当地媒体报道了这一事故，并特别提到了唯一的幸存者大卫。 　　于是，黄瓜黄豆就跟红椒出去了，另带了白胖子和虎子，还叫了两个护卫赶了车拿东西。Perhaps we do not have the conditions to test the network cable performance at low temperature. However, we can test some performance of the network cable under high temperature conditions. Intercept a small section of the network cable and bake it beside the stove. If the network cable can last for about 20 minutes without softening at a temperature of about 50 degrees, then the network cable will pass.(two) the medical service behavior is partially true, but the declared quantity is inconsistent with the actual situation;　　在日本强占时期，经历广岛强制征用的老人金武吉在拍摄遗像照那天收到初恋寄来的信件为开始，故事以过去和现在相互穿插讲述。