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名词解释题
硬度（hardness）
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the clearance of the main bearingB
the diameter of main bearingC
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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
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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
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⑤②③①C
⑤④②③D
②④⑤①
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单选题“hardness”是（）A
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