921工程是什么

简介：According to the imperial court's plan, the East India Company's three-masted warships and new warships will eventually be placed in Qinhuangdao - the Bohai Sea in Tianjin is an inland sea and is frozen in winter, so warships cannot go to sea. However, Qinhuangdao, not far away, is a natural The harbor does not freeze, and warships can attack at any time twelve months a year.