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水的硬度(hardness of water)
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更多 “水的硬度(hardness of water)” 相关考题
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
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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)
考题
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()A
precipitate silica from solutionB
reduce corrosion in the heating coilC
prevent clogging and erosion in the coilD
maintain zero water hardness
考题
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()A
②③④⑤B
⑤②③①C
⑤④②③D
②④⑤①
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名词解释题硬度(hardness)
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