现有四种物质:①碳酸钙 ②明矾 ③硝酸钾 ④葡萄糖,请用相应序

现有四种物质:酸钙 明矾硝酸钾 葡萄糖,请用相应序号填空:

(1) 一种复合肥             (2) 用作补钙剂的是             

(3) 净化水时可作絮凝剂的是            

答案

 (1) ③ (2) ①  (3) ②

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