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【多选题】
以下哪些是B类IP地址?A.
192.168.1.1/24
B.
170.1.2.3/16
C.
191.2.3.4/16
D.
170.6.256.3/16
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A.
when
B.
where
C.
which
D.
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B.
where
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D.
that
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when
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C.
which
D.
that
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when
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D.
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【简答题】Everyone has periods in their lives _______ everything seems so hard.
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