现有浓度为100%的标准C1气样100毫升,要求配制浓度为10%的气样应混入()毫升空气。
A、100
B、1000
C、900
D、990
参考答案:C
书面表达。
假如你是李华,福建省某中学高三学生,请你根据以下图示,用英语写一封信给某中学生英语报。
谈谈自己对边做事边听音乐的看法。
注意:1. 要写出自己的看法(赞成或不赞成)、事例、理由和结论;
2. 短文开头和结尾已给出,不计入总词数;
3. 词数:120左右。
Dear editor,
I'm a student of Senior Three of a middle school in Fujian Province. I'd like to tell you my opinion about
a kind of common behavior I have noticed. It seems that many students enjoy listening to MP3 players while
doing other things. ________________________________________________________________________
________________________________________________________________________________________
Yours sincerely,
Li Hua
火灾盘内的逻辑控制器RA、M里的组态与EEPROM的拷贝不匹配()
A、修理接线故障
B、使用写EEPROM命令修改EEPROM拷贝
C、更换被忽略的电路板
D、重新对探头进行组态