摘要:正 据最新调查,经济开发迅速的越南,大气环境污染日益严重。降尘,越语毕业论文,胡志明市是标准值的4倍,河内是3倍;SO_2浓度分别为1。2倍和1。5倍。污染地区呼吸系统的发病率是非污染地区的3倍。 Abstract:According to the latest survey, the rapid economic development of Vietnam, the increasingly serious environmental pollution. Fall dust, Hu Zhiming city is the standard value of 4 times, Hanoi is 3 times; SO_2 concentrations were 1. 2 times and 1. 5 times. The incidence of respiratory system in polluted area is 3 times of that of non polluted area. 引言:据最新调查,经济开发迅速的越南,大气环境污染日益严重。降尘,胡志明市是标准值的4倍,河内是3倍;S0:浓度分别为1.2倍和1.5倍。污染地区呼吸系统的发病率是非污染地区的3倍。 据调查,越南车辆增加很快,自行车从1990年的60万辆,增长到400万辆,交通阻塞使汽车尾气污染严重。据对 ,越语论文范文 |