双层双面只读DVD盘片的存储容量可以达到（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30251' and id < 2447173 and id<>'2447173' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30251' and id > 2447173 and id<>'2447173' order by id asc limit 5