上期所基本金属期货夜盘收盘全线下跌，氧化铝跌1.68%

Core Viewpoint - The Shanghai Futures Exchange's base metal futures closed lower across the board on September 27, indicating a bearish trend in the market [1]. Group 1: Market Performance - Aluminum oxide fell by 1.68% [1] - Zinc decreased by 1.50% [1] - Nickel dropped by 0.86% [1] - Copper declined by 0.79% [1] - Stainless steel fell by 0.66% [1] - Aluminum decreased by 0.55% [1] - Tin dropped by 0.12% [1] - Lead decreased by 0.09% [1]