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【单选题】
Before inserting a new switch in the network, the network administrator checks that the VTP domain name is correct, the VTP mode is set to server, and revision is lower than the switches in the network. The administrator then configures interfaces and trunks, erases existing VLANs, and connects the switch to the network. Following that procedure, there is no connectivity in the network. What is a possible cause of this problem?()
A.
Because the configuration revision of the new switches is lower than the rest of the network, it can change the VLAN database of the other switches.
B.
As a VTP server, the new switch deleted all VLANs of the network.
C.
Erasing VLANs increases the VTP configuration revision.
D.
Since the configuration revision of the network is higher than the new switch, the VLAN database was automatically synchronized.
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【单选题】We ______ many friends here. [     ]
A.
there is
B.
there are
C.
have got
D.
has got
【多选题】How to write an exposition on air pollution?
A.
What is air pollution?
B.
What are bad effects of air pollution?
C.
What are the causes of air pollution?
D.
What measures can we take to improve air quality?
【多选题】宜采用蒸制软化,以利切片的药物有
A.
玄参
B.
地黄
C.
黄芩
D.
黄精
E.
木瓜
【单选题】在夏季,植物生长的昼夜周期特点是
A.
白天快,夜间慢
B.
白天快,夜间也快
C.
白天慢,夜间快
D.
白天慢,夜间也慢
【简答题】__________________(考虑到天气因素), we got here quite quickly.
【简答题】吸光体之毛茸茸的玩偶
【单选题】Mr Brown, ________, works as manager of the company.
A.
we got here in his car
B.
we got here by car
C.
in whose car we got here
D.
by whose car we got here
【单选题】肝硬化失代偿期并发消化道出血最常见的原因是
A.
食管、胃底静脉曲张破裂出血
B.
门脉高压性胃病
C.
消化性溃疡
D.
急性出血性糜烂性胃炎
E.
胃窦毛细血管扩张症
【单选题】一对标准直齿圆柱齿轮,若 z 1 =18 , z 2 =72 ,则这对齿轮的弯曲应力
A.
σ F1 >σ F2
B.
σ F1 <σ F2
C.
σ F1= σ F2
D.
σ F1 ≤σ F2
【单选题】一对标准直齿圆柱齿轮,若z1=18,z2=72,则这对齿轮的弯曲应力()。
A.
σF1>σF2
B.
σF1
C.
σF1=σF2
D.
σF1≤σF2
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