在STP协议中,端口会在不同的端口状态中进行转换,当一个端口从不转发状态进入转发状态时,需要等待()Forward Delay间隔
A.2个
B.3个
C.4个
D.5个
参考答案:A
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The doctor had almost lost hope at one point, but the patient finally ______. [ ]
A. pulled out
B. pulled through
C. pulled up
D. pulled over