某工程项目施工工艺简单，但工程量难以确定，其发包时宜采用（ ）计价方式。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25977' and id < 2180391 and id<>'2180391' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25977' and id > 2180391 and id<>'2180391' order by id asc limit 5