变压器的参数中，采用标幺值进行计算的好处有（       ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id < 4421436 and id<>'4421436' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id > 4421436 and id<>'4421436' order by id asc limit 5