Views: 0 Author: Hebei Zhengyang Wire Mesh Products Co., Ltd Publish Time: 2016-07-26 Origin: Site
Average adult heights in many countries appear to have peaked 30 to 40 years ago and have declined slightly since then, according to a new study that the authors say is based on the largest set of such data ever gathered.They combined results from 1,472 studies in 200 countries looking at the measured — rather than self-reported or estimated — heights of about 18.6 million people born from 1896 to 1996. The study was published in eLife.Dutchmen born before 2000 were the world’s tallest, and Guatemalan women born before 1900 were the shortest, the study found. South Korean women and Iranian men had the greatest gains in height over the last century. But Guatemalan women also grew, rising from 4 feet 7 inches to 4 feet 11 inches, on average.This phenomenon is even more prominent in Africa.War is the main reason.
The above event is response to us in today’s world of social status.We should consider the situation of the continued violence in how we protect people and police safety problem.The Zhengyang rapid deployment barrier is mainly used for crowd control,riot prevention,prisoner short term detention ,site security,augmented fence perimeter security,and quick site security protection.It can be provide fast and dfficient security defense for our people and police when dangerous happening.
Click here for more products