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    There are a lot of computers in the lab,and they need professional to make sure they can be in a good state. A.operation B.maintenance C.service D.advice 【查看更多】

     

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    There are a lot of computers in the lab,and they need professional __________ to make sure they can be in a good state.

    A.operation           B.maintenance              C.service        D.advice

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    There are a lot of computers in the lab,and they need professional __________ to make sure they can be in a good state.


    1. A.
      operation
    2. B.
      maintenance
    3. C.
      service
    4. D.
      advice

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    There are a lot of computers in the lab, and they need professional ________ to make sure they can be in a good state．

    [　　]
    A．

    operation

    B．

    maintenance

    C．

    service

    D．

    advice

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    There are a lot of computers in the lab,and they need professional 　　 to make sure they can be in a good state.

    A.operation　　　　　　　　　　　B.maintenance

    C.service　　　　　　　　　　　　D.advice

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