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["采购内容"]
["序号","材料名称","规格型号","备注"]
[1,"商品混凝土","C20"]
[2,"商品混凝土","C25"]
[3,"商品混凝土","C25F250"]
[4,"商品混凝土","C30F250"]
[5,"商品混凝土","C40F300"]
[6,"商品混凝土","C50F300"]