《供电服务规范》中规定，供电企业应当建立用电投诉处理制度，公开（）。
参考答案：投诉电话
—What was wrong with you yesterday evening?
—I ________ my homework when the light went off suddenly. [ ]
A. doing
B. was doing
C. did
D. have done
散客旅游的付费方式是（）。
A．全部包价形式
B．部分包价形式
C．零星信用支付
D．现付
