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Choice and No-Choice Bioassays to Study the Pupation Preference and Emergence Success of Ectropis grisescens
Published on: October 30, 2018
Abstract:
Within 5 years from July 1 of 1985 to July 1 of 1990, there were 33.84 million interregional migrants in China, and on the average, each year 5 people in 1000 migrated to other places. According to the 10% sample data from the 4th Census, cities are the places to which people like to move, and Beijing, Tianjin and Shanghai have a highest immigration rate; remote border provinces are the places where people like to move out, and Guangxi, Sichuan and Heilongjiang have the highest emigration rate. With the further reformation and more free policies, people no more cling to their homeland and are more inclined than before to move to other places to find more proper jobs. Specialists indicate that population migration is a result of economic development an inexorable trend of urbanization, and it is significant to have a planned adjustment of spatial population distribution.
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