This equipment is mainly used for measuring bulk density of fluid mud on river bottom and deriving the profile of bulk density with depth,and so it can be judged whether water way dredging needs to be done.是什么意思_This equipment is mainly used for measuring bulk density of fluid mud on river bottom and deriving the profile of bulk density with depth,and so it can be judged whether water way dredging needs to be done.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句