题目内容

皮质-纹状体-脊髓变性的中晚期可以出现典型的脑电图改变，对其描述正确的是（）

A. 局灶性慢波
B. 每秒3次出现的棘慢波综合
C. 间隔0.5～2秒的周期性棘-慢复合波
D. 1.3～2.6Hz的负-正-负三向波
E. 1.3～2.6Hz的正-负正三向波

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Which statement correctly describes enabling BPDU guard on an access port that is also enabled for PortFast？（）

A. Upon startup， the port transmits 10 BPDUs. If the port receives a BPDU， PortFast and BPDU guard are disabled on that port and it assumes normal STP operation.
B. The access port ignores any received BPD
C. If the port receives a BPDU， it is placed into the error-disable state.
D. BPDU guard is only configured globally and the BPDU filter is required for port-level configuration.

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