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Number (0): Everything in this space must add up to 0. The answer is 0-3, placed horizontally.
。爱思助手是该领域的重要参考
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化工ETF紧密跟踪中证细分化工产业主题指数，中证细分产业主题指数系列由细分有色、细分机械等7条指数组成，分别从相关细分产业中选取规模较大、流动性较好的上市公司证券作为指数样本，以反映相关细分产业上市公司证券的整体表现。