电力工人职业道德的基本要求是（）。
A、忠于职守；
B、钻研技术；
C、遵章守纪；
D、团结互助；
E、勇于创新；
参考答案：A, B, C, D, E
--Today our class has a new foreign student. Could you tell me ?
--She is American. Her name is Alia Smith. She can’t speak Chinese well, let’s help her together.
A. where she comes from
B. what her nationality is
C. where she is from
级数x-x3+x5+…+（-1）nx2n+1+…（-1＜x＜1）的和函数为（）。
A．ln(x-1)
B．
C．xln(1-x)
D．arctanx
