【多选题】实现中国梦必须弘扬中国精神,这就是( )。
【单选题】Enclosed are sample parts _____ some of the problems we encountered.
【单选题】We encountered the pathetic sight of a family packing up its home..
【判断题】单一品种采购战略,是指某一品种大批量的订购战略。()
【单选题】We have to think very carefully before we take any action, because it's a very serious situation we have encountered.
【单选题】The polarity of U2 encountered first as we travel around the loop is ( ).
【简答题】在桥式整流、电容滤波、稳压管稳压直流电源电路中,变压器副边电压为 10V ,则整流后的 U O(AV) = ( ) V ,滤波后的 U O(AV) = ( ) V ,二极管所承受的最大反向电压为( )。