题目内容

 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

 

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