到客户处从事用电监察、检查、抄表收费等工作时，要主动出示（），说明来意。工作完毕，向客户表示（）。
参考答案：证件；谢意
句型转换，每空一词。
1. Ann is short. She has short straight hair. (合并为一句)
Ann is short _______ short straight hair.
2. Michael Jackson is tall and thin. (对画线部分提问)
______ does Michael Jackson _______ _______?
3. Tony is of medium height. (改为同义句)
Tony is not _________ and not ________.
4. Every body knows Amy in the city. (改为否定句)
________ _______ Amy in the city.
5. I think Mary is cool. (改为否定句)
I ______ think Mary ________ cool.
A．当单刀双掷开关与a连接时，电压表的示数为22V
B．当单刀双掷开关与b连接时，电压表的示数为11V
C．当单刀双掷开关与a连接，滑动变阻器触头P向上移动的过程中，电压表的示数不变，电流表的示数变大
D．单刀掷开关由a扳向b时（滑动变阻器触头P不动），电压表和电流表的示数均变大
edium height. (改为同义句)
sin
V