单位阶跃函数除了在t=0处不连续，其余都是连续的。（）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32672' and id < 2599022 and id<>'2599022' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32672' and id > 2599022 and id<>'2599022' order by id asc limit 5