在对泡沫灭火系统进行功能验收时，可用手持折射仪测量混合比的是（ ）。[单选]

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29214' and id < 2377466 and id<>'2377466' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29214' and id > 2377466 and id<>'2377466' order by id asc limit 5