毛细血管的直径为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25685' and id < 2159066 and id<>'2159066' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25685' and id > 2159066 and id<>'2159066' order by id asc limit 5