设 a，b，c 为实数，则 a+b+c= 1 是 a2+b2+2ab+ | c-1 | =0的（)

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27159' and id < 2250203 and id<>'2250203' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27159' and id > 2250203 and id<>'2250203' order by id asc limit 5