当采用爆破法进行沉井的辅助下沉时，其刃脚外缘应采用（ ）进行包裹。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26169' and id < 2192946 and id<>'2192946' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26169' and id > 2192946 and id<>'2192946' order by id asc limit 5