“total hardness”簡單造句，total hardness造句子

Distribution and evolution trend of total hardness of shallow groundwater in plain area of Henan Province

Measuring total hardness of water by flow injection spectrophotometry

Comparison test of total hardness of the ground water quality by robust statistical techniques

Results There is a positive correlation between the con centration of water fluoride and that of the total alkalinity and a negative cor relation between the water fluoride and the total hardness and water iodine.

The total hardness, sulfate, chloride and consumption oxygen quantity in mixing water , underground water and surface water existed significant difference(P