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【单选题】
STP 计算中端口在( )状态下时,不转发数据帧,学习MAC 地址表,只参与生成树计算,接收并发送STP 协议帧。A.
Listening
B.
Blocking
C.
Learning
D.
Forwarding
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【简答题】(人们)普遍认为鸟类是从恐龙进化而来的。Birds are widely believed to have ________ dinosaurs.
【简答题】Birds are widely believed to have ________ ________ dinosaurs.(由...进化而来)
【单选题】This passage deals mostly with ______.
A.
how birds lay eggs
B.
how birds keep clean
C.
birds that like water
D.
birds that eat bugs
【单选题】Birds eat fruit and ______ the seeds widely in their droppings
A.
distribute
B.
attribute
C.
contribute
D.
advocate
【简答题】以采购价格分类可将采购方式分成哪几类?并简略介绍这几种采购方式
【简答题】阅读短文，填空。 Birds Although (虽然) all birds may not look the same, all birds have certain things in common (共同点). All birds are warm-blooded. This means that their body temperature always stays the same. B...
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