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简要回答影响鹿茸质量的因素

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作用在梁上的荷载向梁轴线简化,可以简化为、、

对交换机/路由器远程配置时,需要满足什么前提条件？

Della bought a platinum ______ for Jim to match his watch and Jim bought a set of _ for Della. （）

Della was very happy before she bought Jim’s present.（）