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【多选题】
“...hence the sick joke that the reason we have not been contacted by an alien civilization is that civilizations tend to destroy themselves when they reach our stage”从以上句子中找出同位语语从句。(多选)A.
...we have not been contacted by an alien civilization...
B.
...civilizations tend to destroy themselves when they reach our stage...
C.
...the reason we have not been contacted by an alien civilization is that civilizations tend to destroy themselves when they reach our stage...
D.
...when they reach our stage...
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A.
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【简答题】将二进制数1011100.111转换为等值的十六进制数正确的是( )A. B8.E B. 5C.E C. 5C.7 D. B8.