Shenzhen captain Gao Lin put the game to bed on 28 minutes when he scored from a tight angle after Preciado's header parried by Jianye keeper Wang Guoming.
The Rubro-Negro won their opening two matches of South America's premier club competition before it was halted in March because of the coronavirus pandemic.
The "BVB" smoothed the way for their win with three first-half goals, while Dominic Volkmer's red card before half-time left Duisburg hopeless.
Tomas Lapinskas, president of the Lithuanian Wusu Federation, told Xinhua that this year saw no participants from other countries due to COVID-19 quarantine requirements, with the youngest participant being five years old and the oldest around 60.
Plans about the club's structure will be made in close contact with its 160,000 members who have to vote on any significant changes within the club.
In Group B, a late Hattan Bahebri strike helped Saudi Arabia's Al-Hilal defeat the ten men of Uzbekistan side Pakhtakor 2-1.
Like Hoeness Salihamidzic said, Manuel Neuer and Robert Lewandowski are the top-earning performers, and Bayern doesn't intend to extend that finish line.
Bremen pulled a goal back six minutes later after Davie Selke headed Ludwig Augustinsson's pinpoint cross into the area.
The result sends Al-Hilal three points clear at the top of Group B with nine points, while Pakhtakor stay second with six points. The two sides face off again on Thursday. Enditem
Aleksandrs Samoilovs (L) of Latvia competes against Nikita Liamin and Taras Myskiv of Russia during the men's second round match at the 2020 CEV Beach Volleyball European Championships in Jurmala, Latvia, Sept. 19, 2020. (Photo by Edijs Palens/Xinhua)
Both sides posed threats to the other, but no goals were scored in the first half. Chongqing once got a good chance to score in the stoppage time when Brazilian forward Fernandinho Silva was fouled by Cameroon midfielder Joseph Minala in the penalty area. After a VAR ruling, the referee finally canceled the penalty kick because of Fernandinho's handball.