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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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     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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