m, n都是不为0的自然数，且m = 3n，则m和n的最大公约数是（       ）.[吉林2019]

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27159' and id < 2250236 and id<>'2250236' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27159' and id > 2250236 and id<>'2250236' order by id asc limit 5