The main part of water pollution plays a large number of oil industry wastes. Soil is polluted by: litter, wastes, heavy metals, pesticides, radioactive elements. Sinking aerosol may contain heavy poisonous metals and it may lead to plants ruin. The main component of the Earth biosphere represents topsoil.

• 欢迎光临蚌埠医学院护理学系网络课程——护理学基础！ • • • • • • • 早上好!

Nov 23, 2017.