The Synthesis of a New Chromogentic Reagent Dibromo-o-Carboxychlorophosphonazo and its Application for the Determination of Hardness of Water and Calcium of Magnesium in Water;
新显色剂二溴邻羧基偶氮氯膦的合成及其应用于测定水的硬度和钙镁含量
Effect of hardness of water on the expansion rate of sea cucumber
水的硬度对海参涨发率的影响
This process removes the water hardness.
这一工艺去除水的硬度。
a substance that lessens the hardness of water giving it more efficient sudsing.
降低水的硬度、使之更容易起泡沫的物质。
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.
结果南水北调中线供水区水氟含量与水的硬度呈负相关，与水的总碱度、碘含量呈正相关。
The public desires water which is low in hardness and total solids, noncorrosive, and non-scale-forming.
人们希望水的硬度及固体含量都低，无腐蚀性，不生成水垢。
Measuring total hardness of water by flow injection spectrophotometry
流动注射分光光度法测定水的总硬度
Methods for analysis of water for boiler and for cooling--The determination of hardness--Low hardness
GB/T6909.2-1986锅炉用水和冷却水分析方法硬度的测定低硬度
Methods for analysis of water for boiler and for cooling--The determination of hardness--High hardness
GB/T6909.1-1986锅炉用水和冷却水分析方法硬度的测定高硬度
surface active agents-preparation of water with known calcium hardness
表面活性剂－已知钙硬度水的制备
Study on determination method of the trace hardness in feed water used for the boiler
锅炉用水中微量硬度的测定方法研究
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。
Hydration, Hardening and Compressive Strength of Class G Oil Well Cemnet under High Temperature;
高温下G级油井水泥的水化硬化与强度
Experimental Study on Sulfate and Haroness Removal from Mine Waste Water with High Degree of Mineralization;
高矿化度矿井水硫酸盐、总硬度去除的实验研究
Uncertainty Evaluation of Determining Water Hardness by EDTA Titration
EDTA滴定法测定水中硬度的不确定度评定
Evaluation of Uncertainty for Determination of Total Hardness in Water by EDTA Titration
EDTA滴定法测定水中总硬度的不确定度评定
Research on Multiple Chemicals Applicable to Water with Low Hardness and Alkalinity
适合低碱低硬度水的复合缓蚀阻垢剂的研制
Grey prediction of data sequence of the hardness in shallow groundwater in Luoyang
洛阳市浅层地下水硬度的灰色数列预测
Experimental Study on the Removal Effect of Sulfate Radical and Hardness in Mine Wastewater;
矿井水中硫酸根及总硬度去除效果的试验研究
Studies on the Abnormal Phenomenon in Determination of the Hardness of Industrial Water;
对工业用水总硬度测定异常现象的研究