当三相三线电路的中性点直接接地时，宜采用（ ）的有功电能表测量有功电能。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29467' and id < 2398986 and id<>'2398986' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29467' and id > 2398986 and id<>'2398986' order by id asc limit 5