sgtv
幼苗
共回答了19个问题采纳率:100% 举报
The route is in waters and so on lake, harbor, lake provides the safe navigation channel for the ships.But the harbor is the advantage which provides for the ships docking and the safe turnover.If the route and the harbor had the silt siltation problem, then must have to solve it.How but has to solve? This is a question which we must study.
1年前
3