题目内容
紫外线灯管发生红光的原因是( )。
2021-10-14
A.电压过低
B.电压过高
C.灯管漏气
D.点燃时间过长
E.灯管陈旧衰老
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='25683' and id < 2158821 and id<>'2158821' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25683' and id > 2158821 and id<>'2158821' order by id asc limit 5