图3所示的电路中，已知Us=10V，R1=2K，R2=2K，C=10则该电路的时间常数为（   ）。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68472' and id < 4420920 and id<>'4420920' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68472' and id > 4420920 and id<>'4420920' order by id asc limit 5