Cast iron manhole cover anti impact resistance, easy rupture.

铸铁检查井盖不耐冲击，易破裂。

youdao

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。

youdao

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。

youdao