There are a lot of computers in the lab,and they need profes

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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青牛背上客 幼苗

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B

operation操作；maintenance 维护,保持；service服务；advice建议。这里指计算机的专业维护。

1年前

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