[单选]
You are using ADU and are authenticated and associated to an access point. However，you areunable to obtain an IP address.
Which of these has caused this problem？（）

A . invalid SSID
B . invalid WEP key
C . invalid encryption type
D . invalid 802.1X authentication type

现代供应链的概念更加注重围绕柱心企业的网链关系。 19世纪末20世纪初，导致欧洲列强之间矛盾纷繁复杂的最根本原因是（）。第二次科技革命的影响不同。各国国际政治经济地位不同。资本主义各国经济政策不同。资本主义经济政治发展的不平衡。灌浆施工的主要程序是什么？概括而言，我国治水新思路就是实现从工程水利向资源水利的转变。传统的企业管理方法重物流、轻信息，重过程分解、轻系统优化，供应链管理也存在这种问题。

You are using ADU and are authenticated and associated to an access point. However，you areunable to obtain an IP address.
Which of these has caused this problem？（）

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[单选] You are using ADU and are authenticated and associated to an access point. However，you areunable to obtain an IP address. Which of these has caused this problem？（）

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[单选]
You are using ADU and are authenticated and associated to an access point. However，you areunable to obtain an IP address.
Which of these has caused this problem？（）