A股开盘，沪指开跌0.18%，深证成指开跌0.28%，创业板指开跌0.36%，化学纤维板块跌幅居前。

Core Viewpoint - The A-share market opened with declines across major indices, indicating a bearish sentiment in the market [1] Group 1: Market Performance - The Shanghai Composite Index opened down by 0.18% [1] - The Shenzhen Component Index opened down by 0.28% [1] - The ChiNext Index opened down by 0.36% [1] Group 2: Sector Performance - The chemical fiber sector experienced the largest decline among various sectors [1]