正弦稳态电路如图所示，若仅改变图中同名端的位置，那么的相位差将会是（） 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32674' and id < 2599257 and id<>'2599257' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32674' and id > 2599257 and id<>'2599257' order by id asc limit 5