通信设备需用的直流基础电源趋于简化为（ ）V。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29475' and id < 2398406 and id<>'2398406' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29475' and id > 2398406 and id<>'2398406' order by id asc limit 5