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【单选题】
Which command will delete the contents of NVRAM on a router?A.
delete NVRAM
B.
delete startup-config
C.
erase NVRAM
D.
erase start
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皮皮学刷刷变学霸
举一反三
【单选题】The farmers，___________houses had been destroyed by the serious flood，were given help by the government．
A.
who
B.
what
C.
which
D.
whose
【单选题】As a result of the serious flood, two-thirds of the buildings in the area .
A.
need to repair
B.
needs to repair
C.
needs repairing
D.
need repairing
【简答题】天线两臂总长2l=λ的对称振子叫做 （全波/半波）对称天线。A. 全波
【简答题】半波对称振子天线总长2l=A. 波长的一半
【简答题】设以半波振子为接收天线，用来接收波长为λ、极化方向与振子平行的线极化平面波，试求其有效接收面积。
【简答题】基本半波振子的长度是（），而折合半波振子的总长为（）。
【简答题】理想导电面上方水平放置的半波振子天线如图(a)所示。
【单选题】第一节 单项填空 从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。 The flood did not start to ______ until two days after the rain had stopped.
A.
retire
B.
recede
C.
shrink
D.
retreat
【判断题】1.
Two hundred people were rescued by emergency services over the weekend in the
level of the flood. (T/F)
A.
正确
B.
错误
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