名词解释题水的硬度（hardness of water）
名词解释题
水的硬度（hardness of water）
参考解析
解析：
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相关考题：
The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to______.A.precipitate(使沉淀) silica （硅石）from solutionB.reduce corrosion in the heating coilC.prevent clogging and erosion in the coilD.maintain zero water hardness
单选题Which of the following may hardness of the boiler water cause?（） (1) scale formation (2) tube failure (3) corrosionA（1）and（2）B（1）and（3）C（2）and（3）D（1），（2）and（3）
单选题The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to（）Aprecipitate silica from solutionBreduce corrosion in the heating coilCprevent clogging and erosion in the coilDmaintain zero water hardness
单选题眼镜片膜层有 ①dye ②Antireflection film ③Water-proof film ④Hardness film ⑤Impact resistantfilm，膜层由表及里的顺序是（）A②③④⑤B⑤②③①C⑤④②③D②④⑤①
多选题天然水按硬度可分为低硬度水、一般硬度水、（）。A较高硬度水B永久硬度水C高硬度水D极高硬度水