China's guided missile destroyer "Qingdao" docks at a harbor in Qingdao, a coastal city in East China's Shandong Province November 7, 2006. China's guided missile destroyer "Qingdao" and replenishment oiler "Hongzehu" concluded their goodwill visit to the United States, Canada and Philippines after a 79-day tour covering over 20,000 sea miles.