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【单选题】
技术员小张在调试交换机时发现,交换机工作转发数据帧时,如果在MAC 地址表中没有查到数据帧的源地址,交换机会( )A.
丢弃该帧
B.
学习源MAC 地址，将此地址加入到MAC 地址表中
C.
广播发送该帧
D.
交换机不根据数据帧的源地址进行转发，因此交换机转发该帧，不做其他任何操作
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反馈参考答案：
举一反三
【单选题】What witness may exaggerate the fact, or provide inaccurate description?
A.
Indifference witness.
B.
Interested witness.
C.
Hostile witness.
D.
Reticent witness.
【单选题】Many people stood near the bus stop, nervously waiting________.
A.
to pick up
B.
picking up
C.
to be picked up
D.
being picked up
【单选题】下列关于双向晶闸管工作原理的正确说法是
A.
由两只单向晶闸管反向并联，将G极接在一起
B.
由两只单向晶闸管同向并联，将G极接在一起
C.
由一只NPN管与一只PNP管，将C极与B极两两互连，引出来三个电极
D.
以上说法都不对
【单选题】The statement of the witness ( 证人 ) was pure _____ ( 猜测 ). The suspect ( 嫌疑人 ) was given bail ( 保释 ) by the local court.
A.
speculation
B.
passion
C.
prosperity
D.
property
【单选题】There are many things in a culture children pick up naturally as they grow up.
A.
Y
B.
N
C.
NG
【单选题】Which of the following is the best kind of witness for a case?
A.
Indifference witness.
B.
Interested witness.
C.
Hostile witness.
D.
Reticent witness.
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