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植物残体中最难生物降解的是（），分解极其缓慢。

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若RBC接收到位置不在RBC管辖范围内的列车（），则RBC应向该列车发送终止通信会话的命令。

在西方思想史上，率先把政治与道德分离开，并将权力置于政治生活中心的是亚历士多德。

A. 正确
B. 错误

进行静压沉入桩施工的作业人员，应按国家规定的时间内容进行体格检查，必须持有（）。

You are working with CIS .com. who has identified the following IP applications on their network: IP voice and voice signaling, streaming video, PeopleSoft, Microsoft SQL, e-mail, and Internet traffic. If the voice traffic was classified as EF and AF31, the e-mail was classified as AF11, and the Internet traffic was classified as DSCP 0, how would the transactional traffic represented as PeopleSoft and Microsoft SQL be classified?（）

A. DSCP AF21
B. DSCP CS4
C. DSCP AF33
DSCP AF13