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 以下物质的用途不合理的是

  A.晶体硅:半导体材料     B.尿素: 食品发酵剂

C.二氧化硅:光导纤维      D.液氮:冷冻物质                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                

 

答案:
 B
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