class b river 中文意思是什麼
class b river
解釋
二級河流-
This dredger navigates and operates on tong guan section of yellow river belonging to inland river class b navigational area
本船航行並作業于黃河潼關河段,航區為內河b級。 -
The boat may be moored on waters of inland river class a, b or c navigational areas
,可供7000人同時用餐,可停泊在內河a b或c級航區水域。
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