21 "Are filters managed properly? Clean frequency, renew frequency?
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clean frequency
清洁频率
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Is the filtration system adequate? What's the clean frequency and renew frequency?
过滤系统是否完善？清洁频率与更换频率是多少？
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Are filters managed properly? Clean frequency, renew frequency?
过滤器管控是否恰当？清洁频率，更新频率是多少？
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