The concrete in concrete gravity dam,especially in RCC dam,is a stratified structure,so that its stratification feature is key to the safety of concrete dam.是什么意思_The concrete in concrete gravity dam,especially in RCC dam,is a stratified structure,so that its stratification feature is key to the safety of concrete dam.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句