【简答题】听力原文:In order to improve our speaking, what should we do? In order to improve our speaking, what should we do? We should ______ to our classmates and English teachers daily.
【判断题】整流电路是把正弦交流电变换成脉动直流电的电路。
【单选题】What did your class teacher ________you to _______at the meeting?
【判断题】整流电路可以把交流电变为直流电,也可以把直流电变为交流电。( )
【单选题】把交流电变为脉动的直流电的电路是( )。