dredging unit 中文意思是什麼
dredging unit
解釋
疏浚用船-
If provided with high pressure pump and water gun, it can make up a hydraulic mechanized earth work unit, used for ground leveling, dredging in rivers and pools, digging, excavation and transportation in small hydraulic engineering, as well as the air defense and underground project in cities
若與高壓水泵，水槍配合，組成水力機械化土方工程機組，就可用作于土地平整，河道與池塘的疏浚、鑿開等小型水力工程的挖方與輸方，以及城市的防空工程，地下工程。 -
Yan jiang zheng, chairman of the china association for expedition is seen operating a portable dredging unit during the 1998 search of lake dianchi
中國探險協會主席嚴江征在1998年在滇池搜尋飛機期間駕駛著一艘輕便的捕撈船。 -
But when the dredged length have increased to a certain value, the increment of water level drop datum decreased continuously with length increase of dredging channel. in other word, unit length increment tends to slowly. when dredging channel length is in a certain datum region, the effect of dredging sediment for deposition reduction is better relatively
但是，當長度增加到一定值以後，隨挖河長度的增加，水位跌落值增量不斷減小，即單位長度的增加量逐漸趨緩；當挖河長度取于某一值域內時，挖河的減淤效果才相對較佳。
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