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设集合A={x||x-a|<1,x∈R},B={x||x-b|>2,x∈R}.若...
设集合A={x||x-a|<1,x∈R},B={x||x-b|>2,x∈R}.若A⊆B,则实数a,b必满足( )
A.|a+b|≤3
B.|a+b|≥3
C.|a-b|≤3
D.|a-b|≥3
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