Cast iron square gates with bronze inlaid, for maintenance, are installed before and behind each coarse bar screen.

每台粗格栅前后渠道内设有铸铁镶铜方闸门，以备检修时用。

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Cast iron square gates with bronze inlaid, for maintenance, are installed before and behind each coarse bar screen.

每台粗格栅前后渠道内设有铸铁镶铜方闸门，以备检修时用。

youdao