【单选题】电动机的额定功率是指在额定运行状态下()。
【判断题】声调就是声音的高低升降的变化,声调又叫字调。
【单选题】电动机的额定功率是指在额定运行状态下( )。
【简答题】听下面一段材料,回答第1-4题。 1. What do the speakers do with the box? A. They put it in the lift. B. They bring it to the office. C. They carry it up the stairs. 2. What does the woman do after lunch if she has t...