It has the effect keeping heavy section ductile iron casting from...
对于大断面球墨铸铁件，有防止球化不良和消除反白口的作用。
It is better in wet period, which only performs heavy pollution in 2.1 and 9 section.
丰水期的情况稍好，只有2.1断面和9断面表现为重污染以上。
It is better in wet period, which only performs heavy pollution in 2.1 and 9 section.
丰水期的情况稍好，只有2.1断面和9断面表现为重污染以上。
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