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密闭系统所要求的水质一般是软化水。
The water quality required in the closed circulation is generally of the soft water.
youdao
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这就是许多使用软化水的锅炉仍结垢的原因。
It is used in many demineralized water boiler scale.
youdao
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这就是许多使用软化水的锅炉仍结垢的原因。
It is used in many demineralized water boiler scale.
youdao