To solve the north high hardness of water quality, and hardness of the water quality in the south.
能够解决北方高硬度水质，以及南方中硬度水质。
Uncertain degree is evaluated to adopt EDTA titrimetric law to measure total hardness of water quality.
采用EDTA滴定法测定水质总硬度的测量不确定度评定。
The effect of the water alkalinity and the water hardness on noodle quality was reviewed.
研究了水的碱度、硬度对面条品质的影响。
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