题目

电子式电能表是通过指示灯的闪烁次数imp来代替转盘转动圈数r的，如图8所示，如表盘上标的是“3200imp/(kW·h)”字样，那么其含义应该是_____________．将某用电器单独接在该电子式电能表上工作20min，电能表指示灯  闪烁了320次，则该用电器在上述时间内消耗的电能为__________kW·h，它的电功率是__________W 答案：消耗1 kW·h的电，指示灯闪烁3200次；0.1；300解析:略On the clothes line______ many nice clothes. Kate with her parents______ them this time an hour ago. A．are, are hanging B．is, were hung C．is, is hanging D．are, was hanging