台湾“左镇人”头骨化石是哪一年发现的，它与史前“北京人”有什么关系？
查看答案
转炉吹炼过程中，炉渣化好化透的特征是炉内声音柔和，喷出物不带铁，无火花，呈片状，落在炉壳上不粘附。
A. 正确
B. 错误
在Flash中，关于套索工具说法不正确的是（）
A. 可以勾画出曲线或直边选择区域
B. 可以选择不规则选区
C. 套索只对形状起作用，对绘制对象无效
D. 其他选项都不正确
To which switch or switches should you provide redundant links in order to achieve high availability with reliable fast convergence in the enterprise campus？（）
A. to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 2 link
B. to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3 link
C. to two core switches from redundant distribution switches connected with Layer 2 link
D. to two core switches from redundant distribution switches connected with Layer 3 link
E. to two core switches running Cisco NSF and SSO from two redundant distribution switches running Cisco NSF and SSO
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