几MHz且频率连续可调的振荡器应选用（ ）振荡器。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id < 2444254 and id<>'2444254' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id > 2444254 and id<>'2444254' order by id asc limit 5