A study is made on the drop of water supply capacity of cast iron pipes caused by pipe ageing on the basis of Hazen-William water conveyance capacity computation formula.是什么意思_A study is made on the drop of water supply capacity of cast iron pipes caused by pipe ageing on the basis of Hazen-William water conveyance capacity computation formula.在線翻譯_英語_讀音_用法_例句