配电箱内应设置漏电保护器，其额定漏电动作电流和额定漏电动作时_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

配电箱内应设置漏电保护器，其额定漏电动作电流和额定漏电动作时间应安全可靠。总配电箱内的漏电保护器，额定漏电动作电流与额定漏电时间的乘积最高应限制在()mA·s内。

A．30
B．45
C．60
D．75

答案

参考答案：A

解析：配电箱、开关箱内应设置漏电保护器，其额定漏电动作电流和额定漏电动作时间应安全可靠(一般额定漏电电流小于等于30mA，额定漏电动作时间小于0.1s)，并有合适的分级配合。但总配电箱内的漏电保护器，其额定漏电动作电流与额定漏电动作时间的乘积最高应限制在30mA·s以内。

阅读理解

任务型阅读。有5个人想分别参加一项活动。请为每个人选出最适合的一项活动。

( ) 1. Joe is studying English. He hopes
            either to write plays or to be an actor. He enjoys
          plays about real people who led interesting
           lives.
( ) 2. Glenda is studying the history of
            music at college. She wants to listen to as much
            music from the past as possible, and she
            especially likes listening to people singing.
( ) 3. Wong is a dancer from China. He
            would like to see people from different parts of
            the world dancing to get some new ideas.
(    ) 4. Ruth is a teacher who planning to
            start a drama (戏剧) club for the children at her
            school. She would like to
            see some children acting if possible.
( ) 5. Maria is celebrating her birthday
            tomorrow. She wants to go out for the whole
           day with her friends. They all enjoy listening to
           pop music.

A. International Youth Celebration (getting
    together with students from different
    countries, dancing and singing.
B. River Festival (A day of fun on the river
    bank with a Chinese theme)
C. Songs of summer (Hutton Consort will sing
    songs old and new, all of which are about
    the summer.)
D. Music in the Open Air ( Jimmy and his
    band play dance music through the day in
    the open air)
E. A star May Be Born ( Some plays from
    children's stories are showed by 7 to
    11-year-old children for parents, families
    and friends)
F. Vita and Harold ( A play about a couple's
   lives and their most unusual marriage)

填空题

课堂教学过程一般有引起学习动机，领会知识，巩固知识、（）检查知识等几个阶段。