硬脂酸镁通常在处方中起何种作用（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27510' and id < 2269804 and id<>'2269804' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27510' and id > 2269804 and id<>'2269804' order by id asc limit 5