树脂多为植物体内哪一类成分经过复杂的化学变化而形成的

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30685' and id < 2473181 and id<>'2473181' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30685' and id > 2473181 and id<>'2473181' order by id asc limit 5