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【单选题】
下列（ ）不是典型防火墙系统的主要组成部分。A.
分组过滤路由器
B.
电路层网关
C.
物理层网桥 ~~
D.
应用层网关
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【简答题】Ma Wendi graduated from a veterinary(兽医的) school several years ago. And now she is used to 1 (glance) at curiously when she walks six dogs at the same time. They are not all 2 . The 25-year-old vet...
【单选题】In the dark forest , some large enough to hold several English towns. [ ]
A.
stand many lakes
B.
lie many lakes
C.
many lakes lie
D.
many lakes stand
【单选题】The speaker _____ several other subjects in the course of his talk but mostly kept himself to the main topic.
A.
held on
B.
worked out
C.
touched on
D.
kept out of
【单选题】(2013·天津新华中学二次月考)________ several times，he still couldn't understand how to operate the machine.
A.
Telling
B.
Having told
C.
To be told
D.
Having been told
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