两个无源二端口串联时,其复合二端口的传输参数应选则（）计算较为方便。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32636' and id < 2595070 and id<>'2595070' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32636' and id > 2595070 and id<>'2595070' order by id asc limit 5