Mineral compounds are made of elements such as sulphur, phosphorus, iron, potassium, sodium, and calcium.
无机化合物是由诸如硫、磷、铁、钾、钠和钙等元素组成。
2
According to the study agriculture is responsible for 43.7% of the nation's chemical oxygen demand (the main measure of organic compounds in water) 67% of phosphorus and 57% of nitrogen discharges.
According to the study, agriculture is responsible for 43.7% of the nation's chemical oxygen demand (the main measure of organic compounds in water), 67% of phosphorus and 57% of nitrogen discharges.