原文由 jjwws(jjwws) 发表:
In national regulation, there are 5 toxic heavy metals in ambient air.
They are mercury, lead,cadmium, chromium and arsenic.
In 12th 5-year-plan of environment , these 5 heavy metals are ordered to be detected. We need a long time to decrease heavy metal pollution.
原文由 潮濕的木頭(flying-free) 发表:原文由 jjwws(jjwws) 发表:
In national regulation, there are 5 toxic heavy metals in ambient air.
They are mercury, lead,cadmium, chromium and arsenic.
In 12th 5-year-plan of environment , these 5 heavy metals are ordered to be detected. We need a long time to decrease heavy metal pollution.