Cast iron manhole cover anti impact resistance, easy rupture.
铸铁检查井盖不耐冲击，易破裂。
Cast iron manhole cover of good quality is to see its toughness and hardness.
质量好的铸铁井盖是要看其韧度和硬度的。
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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