The main cast iron manhole cover is being applied in the sewers of the city, but the cause of quality problems in what factors?
铸铁井盖主要是被应用在城市下水道中，但造成其质量问题的因素在哪些？
The main cast iron manhole cover is being applied in the sewers of the city, but the cause of quality problems in what factors?
铸铁井盖主要是被应用在城市下水道中，但造成其质量问题的因素在哪些？
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