由单体物质形成多聚物是由（ ）连接的。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29807' and id < 2419232 and id<>'2419232' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29807' and id > 2419232 and id<>'2419232' order by id asc limit 5