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【单选题】
已知x=0.a1a2a3a4a5a6(ai为0或1),若要x>=1/8 ,则ai各取。
A.
a1=a2=0,a3=1 a4-a6不全为0即可
B.
只要a1,a2,a3不全为0即可
C.
a2=1
D.
a3=1
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