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【单选题】
B 类地址的缺省掩码是( )A.
255.0.0.0
B.
255.255.255.0
C.
255.255.0.0
D.
255.255.0.0 .
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【单选题】The letter was______as it was the only one ever signed by the the Queen.
A.
unusual
B.
unique
C.
rare
D.
scarce
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A.
Everyone
B.
Anyone
C.
Someone
D.
No one
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