当胎头娩出时，胎儿双肩径沿某一径线下 降，该径线是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25957' and id < 2177012 and id<>'2177012' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25957' and id > 2177012 and id<>'2177012' order by id asc limit 5