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Gaokao Chemistry Practice Question

2.(6 分)下列说法正确的是()

  1. A.医用酒精的浓度通常是 $95 \%$
  2. B.单质硅是将太阳能转化为电能的常用材料
  3. C.淀粉、纤维素和油脂都属于天然高分子化合物
  4. D.合成纤维和光导纤维都是新型无机非金属材料

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