地理常识,中朝俄交界的图们江下游段,每年4月为春汛,7-8月为夏汛,冬季结冰,稳定封冻期约120天,4月到11月才能通航
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http://www.dasc.org.cn/?news/383
https://finance.eastmoney.com/a/202407063123372593.html
https://www.163.com/dy/article/IERR4KIV05562NV6.html