根据互易律原理,要保持曝光量不变,光圈缩小两档，快门速度必须(  )。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='27861' and id < 2288739 and id<>'2288739' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27861' and id > 2288739 and id<>'2288739' order by id asc limit 5